Upload the ESR GUI seed code

Issue-ID: AAI-68

Change-Id: Ia50ce0570c2fabecd77199d4e8454f56fe587c4e
Signed-off-by: lizi00164331 <li.zi30@zte.com.cn>

11 files changed, 3898 insertions, 0 deletions

diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/application.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/application.js
new file mode 100644
index 0000000..0ee4def
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/application.js
@@ -0,0 +1,643 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var finalhandler = require('finalhandler');
+var Router = require('./router');
+var methods = require('methods');
+var middleware = require('./middleware/init');
+var query = require('./middleware/query');
+var debug = require('debug')('express:application');
+var View = require('./view');
+var http = require('http');
+var compileETag = require('./utils').compileETag;
+var compileQueryParser = require('./utils').compileQueryParser;
+var compileTrust = require('./utils').compileTrust;
+var deprecate = require('depd')('express');
+var flatten = require('array-flatten');
+var merge = require('utils-merge');
+var resolve = require('path').resolve;
+var slice = Array.prototype.slice;
+
+/**
+ * Application prototype.
+ */
+
+var app = exports = module.exports = {};
+
+/**
+ * Variable for trust proxy inheritance back-compat
+ * @private
+ */
+
+var trustProxyDefaultSymbol = '@@symbol:trust_proxy_default';
+
+/**
+ * Initialize the server.
+ *
+ *   - setup default configuration
+ *   - setup default middleware
+ *   - setup route reflection methods
+ *
+ * @private
+ */
+
+app.init = function init() {
+  this.cache = {};
+  this.engines = {};
+  this.settings = {};
+
+  this.defaultConfiguration();
+};
+
+/**
+ * Initialize application configuration.
+ * @private
+ */
+
+app.defaultConfiguration = function defaultConfiguration() {
+  var env = process.env.NODE_ENV || 'development';
+
+  // default settings
+  this.enable('x-powered-by');
+  this.set('etag', 'weak');
+  this.set('env', env);
+  this.set('query parser', 'extended');
+  this.set('subdomain offset', 2);
+  this.set('trust proxy', false);
+
+  // trust proxy inherit back-compat
+  Object.defineProperty(this.settings, trustProxyDefaultSymbol, {
+    configurable: true,
+    value: true
+  });
+
+  debug('booting in %s mode', env);
+
+  this.on('mount', function onmount(parent) {
+    // inherit trust proxy
+    if (this.settings[trustProxyDefaultSymbol] === true
+      && typeof parent.settings['trust proxy fn'] === 'function') {
+      delete this.settings['trust proxy'];
+      delete this.settings['trust proxy fn'];
+    }
+
+    // inherit protos
+    this.request.__proto__ = parent.request;
+    this.response.__proto__ = parent.response;
+    this.engines.__proto__ = parent.engines;
+    this.settings.__proto__ = parent.settings;
+  });
+
+  // setup locals
+  this.locals = Object.create(null);
+
+  // top-most app is mounted at /
+  this.mountpath = '/';
+
+  // default locals
+  this.locals.settings = this.settings;
+
+  // default configuration
+  this.set('view', View);
+  this.set('views', resolve('views'));
+  this.set('jsonp callback name', 'callback');
+
+  if (env === 'production') {
+    this.enable('view cache');
+  }
+
+  Object.defineProperty(this, 'router', {
+    get: function() {
+      throw new Error('\'app.router\' is deprecated!\nPlease see the 3.x to 4.x migration guide for details on how to update your app.');
+    }
+  });
+};
+
+/**
+ * lazily adds the base router if it has not yet been added.
+ *
+ * We cannot add the base router in the defaultConfiguration because
+ * it reads app settings which might be set after that has run.
+ *
+ * @private
+ */
+app.lazyrouter = function lazyrouter() {
+  if (!this._router) {
+    this._router = new Router({
+      caseSensitive: this.enabled('case sensitive routing'),
+      strict: this.enabled('strict routing')
+    });
+
+    this._router.use(query(this.get('query parser fn')));
+    this._router.use(middleware.init(this));
+  }
+};
+
+/**
+ * Dispatch a req, res pair into the application. Starts pipeline processing.
+ *
+ * If no callback is provided, then default error handlers will respond
+ * in the event of an error bubbling through the stack.
+ *
+ * @private
+ */
+
+app.handle = function handle(req, res, callback) {
+  var router = this._router;
+
+  // final handler
+  var done = callback || finalhandler(req, res, {
+    env: this.get('env'),
+    onerror: logerror.bind(this)
+  });
+
+  // no routes
+  if (!router) {
+    debug('no routes defined on app');
+    done();
+    return;
+  }
+
+  router.handle(req, res, done);
+};
+
+/**
+ * Proxy `Router#use()` to add middleware to the app router.
+ * See Router#use() documentation for details.
+ *
+ * If the _fn_ parameter is an express app, then it will be
+ * mounted at the _route_ specified.
+ *
+ * @public
+ */
+
+app.use = function use(fn) {
+  var offset = 0;
+  var path = '/';
+
+  // default path to '/'
+  // disambiguate app.use([fn])
+  if (typeof fn !== 'function') {
+    var arg = fn;
+
+    while (Array.isArray(arg) && arg.length !== 0) {
+      arg = arg[0];
+    }
+
+    // first arg is the path
+    if (typeof arg !== 'function') {
+      offset = 1;
+      path = fn;
+    }
+  }
+
+  var fns = flatten(slice.call(arguments, offset));
+
+  if (fns.length === 0) {
+    throw new TypeError('app.use() requires middleware functions');
+  }
+
+  // setup router
+  this.lazyrouter();
+  var router = this._router;
+
+  fns.forEach(function (fn) {
+    // non-express app
+    if (!fn || !fn.handle || !fn.set) {
+      return router.use(path, fn);
+    }
+
+    debug('.use app under %s', path);
+    fn.mountpath = path;
+    fn.parent = this;
+
+    // restore .app property on req and res
+    router.use(path, function mounted_app(req, res, next) {
+      var orig = req.app;
+      fn.handle(req, res, function (err) {
+        req.__proto__ = orig.request;
+        res.__proto__ = orig.response;
+        next(err);
+      });
+    });
+
+    // mounted an app
+    fn.emit('mount', this);
+  }, this);
+
+  return this;
+};
+
+/**
+ * Proxy to the app `Router#route()`
+ * Returns a new `Route` instance for the _path_.
+ *
+ * Routes are isolated middleware stacks for specific paths.
+ * See the Route api docs for details.
+ *
+ * @public
+ */
+
+app.route = function route(path) {
+  this.lazyrouter();
+  return this._router.route(path);
+};
+
+/**
+ * Register the given template engine callback `fn`
+ * as `ext`.
+ *
+ * By default will `require()` the engine based on the
+ * file extension. For example if you try to render
+ * a "foo.jade" file Express will invoke the following internally:
+ *
+ *     app.engine('jade', require('jade').__express);
+ *
+ * For engines that do not provide `.__express` out of the box,
+ * or if you wish to "map" a different extension to the template engine
+ * you may use this method. For example mapping the EJS template engine to
+ * ".html" files:
+ *
+ *     app.engine('html', require('ejs').renderFile);
+ *
+ * In this case EJS provides a `.renderFile()` method with
+ * the same signature that Express expects: `(path, options, callback)`,
+ * though note that it aliases this method as `ejs.__express` internally
+ * so if you're using ".ejs" extensions you dont need to do anything.
+ *
+ * Some template engines do not follow this convention, the
+ * [Consolidate.js](https://github.com/tj/consolidate.js)
+ * library was created to map all of node's popular template
+ * engines to follow this convention, thus allowing them to
+ * work seamlessly within Express.
+ *
+ * @param {String} ext
+ * @param {Function} fn
+ * @return {app} for chaining
+ * @public
+ */
+
+app.engine = function engine(ext, fn) {
+  if (typeof fn !== 'function') {
+    throw new Error('callback function required');
+  }
+
+  // get file extension
+  var extension = ext[0] !== '.'
+    ? '.' + ext
+    : ext;
+
+  // store engine
+  this.engines[extension] = fn;
+
+  return this;
+};
+
+/**
+ * Proxy to `Router#param()` with one added api feature. The _name_ parameter
+ * can be an array of names.
+ *
+ * See the Router#param() docs for more details.
+ *
+ * @param {String|Array} name
+ * @param {Function} fn
+ * @return {app} for chaining
+ * @public
+ */
+
+app.param = function param(name, fn) {
+  this.lazyrouter();
+
+  if (Array.isArray(name)) {
+    for (var i = 0; i < name.length; i++) {
+      this.param(name[i], fn);
+    }
+
+    return this;
+  }
+
+  this._router.param(name, fn);
+
+  return this;
+};
+
+/**
+ * Assign `setting` to `val`, or return `setting`'s value.
+ *
+ *    app.set('foo', 'bar');
+ *    app.get('foo');
+ *    // => "bar"
+ *
+ * Mounted servers inherit their parent server's settings.
+ *
+ * @param {String} setting
+ * @param {*} [val]
+ * @return {Server} for chaining
+ * @public
+ */
+
+app.set = function set(setting, val) {
+  if (arguments.length === 1) {
+    // app.get(setting)
+    return this.settings[setting];
+  }
+
+  debug('set "%s" to %o', setting, val);
+
+  // set value
+  this.settings[setting] = val;
+
+  // trigger matched settings
+  switch (setting) {
+    case 'etag':
+      this.set('etag fn', compileETag(val));
+      break;
+    case 'query parser':
+      this.set('query parser fn', compileQueryParser(val));
+      break;
+    case 'trust proxy':
+      this.set('trust proxy fn', compileTrust(val));
+
+      // trust proxy inherit back-compat
+      Object.defineProperty(this.settings, trustProxyDefaultSymbol, {
+        configurable: true,
+        value: false
+      });
+
+      break;
+  }
+
+  return this;
+};
+
+/**
+ * Return the app's absolute pathname
+ * based on the parent(s) that have
+ * mounted it.
+ *
+ * For example if the application was
+ * mounted as "/admin", which itself
+ * was mounted as "/blog" then the
+ * return value would be "/blog/admin".
+ *
+ * @return {String}
+ * @private
+ */
+
+app.path = function path() {
+  return this.parent
+    ? this.parent.path() + this.mountpath
+    : '';
+};
+
+/**
+ * Check if `setting` is enabled (truthy).
+ *
+ *    app.enabled('foo')
+ *    // => false
+ *
+ *    app.enable('foo')
+ *    app.enabled('foo')
+ *    // => true
+ *
+ * @param {String} setting
+ * @return {Boolean}
+ * @public
+ */
+
+app.enabled = function enabled(setting) {
+  return Boolean(this.set(setting));
+};
+
+/**
+ * Check if `setting` is disabled.
+ *
+ *    app.disabled('foo')
+ *    // => true
+ *
+ *    app.enable('foo')
+ *    app.disabled('foo')
+ *    // => false
+ *
+ * @param {String} setting
+ * @return {Boolean}
+ * @public
+ */
+
+app.disabled = function disabled(setting) {
+  return !this.set(setting);
+};
+
+/**
+ * Enable `setting`.
+ *
+ * @param {String} setting
+ * @return {app} for chaining
+ * @public
+ */
+
+app.enable = function enable(setting) {
+  return this.set(setting, true);
+};
+
+/**
+ * Disable `setting`.
+ *
+ * @param {String} setting
+ * @return {app} for chaining
+ * @public
+ */
+
+app.disable = function disable(setting) {
+  return this.set(setting, false);
+};
+
+/**
+ * Delegate `.VERB(...)` calls to `router.VERB(...)`.
+ */
+
+methods.forEach(function(method){
+  app[method] = function(path){
+    if (method === 'get' && arguments.length === 1) {
+      // app.get(setting)
+      return this.set(path);
+    }
+
+    this.lazyrouter();
+
+    var route = this._router.route(path);
+    route[method].apply(route, slice.call(arguments, 1));
+    return this;
+  };
+});
+
+/**
+ * Special-cased "all" method, applying the given route `path`,
+ * middleware, and callback to _every_ HTTP method.
+ *
+ * @param {String} path
+ * @param {Function} ...
+ * @return {app} for chaining
+ * @public
+ */
+
+app.all = function all(path) {
+  this.lazyrouter();
+
+  var route = this._router.route(path);
+  var args = slice.call(arguments, 1);
+
+  for (var i = 0; i < methods.length; i++) {
+    route[methods[i]].apply(route, args);
+  }
+
+  return this;
+};
+
+// del -> delete alias
+
+app.del = deprecate.function(app.delete, 'app.del: Use app.delete instead');
+
+/**
+ * Render the given view `name` name with `options`
+ * and a callback accepting an error and the
+ * rendered template string.
+ *
+ * Example:
+ *
+ *    app.render('email', { name: 'Tobi' }, function(err, html){
+ *      // ...
+ *    })
+ *
+ * @param {String} name
+ * @param {Object|Function} options or fn
+ * @param {Function} callback
+ * @public
+ */
+
+app.render = function render(name, options, callback) {
+  var cache = this.cache;
+  var done = callback;
+  var engines = this.engines;
+  var opts = options;
+  var renderOptions = {};
+  var view;
+
+  // support callback function as second arg
+  if (typeof options === 'function') {
+    done = options;
+    opts = {};
+  }
+
+  // merge app.locals
+  merge(renderOptions, this.locals);
+
+  // merge options._locals
+  if (opts._locals) {
+    merge(renderOptions, opts._locals);
+  }
+
+  // merge options
+  merge(renderOptions, opts);
+
+  // set .cache unless explicitly provided
+  if (renderOptions.cache == null) {
+    renderOptions.cache = this.enabled('view cache');
+  }
+
+  // primed cache
+  if (renderOptions.cache) {
+    view = cache[name];
+  }
+
+  // view
+  if (!view) {
+    var View = this.get('view');
+
+    view = new View(name, {
+      defaultEngine: this.get('view engine'),
+      root: this.get('views'),
+      engines: engines
+    });
+
+    if (!view.path) {
+      var dirs = Array.isArray(view.root) && view.root.length > 1
+        ? 'directories "' + view.root.slice(0, -1).join('", "') + '" or "' + view.root[view.root.length - 1] + '"'
+        : 'directory "' + view.root + '"'
+      var err = new Error('Failed to lookup view "' + name + '" in views ' + dirs);
+      err.view = view;
+      return done(err);
+    }
+
+    // prime the cache
+    if (renderOptions.cache) {
+      cache[name] = view;
+    }
+  }
+
+  // render
+  tryRender(view, renderOptions, done);
+};
+
+/**
+ * Listen for connections.
+ *
+ * A node `http.Server` is returned, with this
+ * application (which is a `Function`) as its
+ * callback. If you wish to create both an HTTP
+ * and HTTPS server you may do so with the "http"
+ * and "https" modules as shown here:
+ *
+ *    var http = require('http')
+ *      , https = require('https')
+ *      , express = require('express')
+ *      , app = express();
+ *
+ *    http.createServer(app).listen(80);
+ *    https.createServer({ ... }, app).listen(443);
+ *
+ * @return {http.Server}
+ * @public
+ */
+
+app.listen = function listen() {
+  var server = http.createServer(this);
+  return server.listen.apply(server, arguments);
+};
+
+/**
+ * Log error using console.error.
+ *
+ * @param {Error} err
+ * @private
+ */
+
+function logerror(err) {
+  /* istanbul ignore next */
+  if (this.get('env') !== 'test') console.error(err.stack || err.toString());
+}
+
+/**
+ * Try rendering a view.
+ * @private
+ */
+
+function tryRender(view, options, callback) {
+  try {
+    view.render(options, callback);
+  } catch (err) {
+    callback(err);
+  }
+}
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/express.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/express.js
new file mode 100644
index 0000000..540c8be
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/express.js
@@ -0,0 +1,103 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+var EventEmitter = require('events').EventEmitter;
+var mixin = require('merge-descriptors');
+var proto = require('./application');
+var Route = require('./router/route');
+var Router = require('./router');
+var req = require('./request');
+var res = require('./response');
+
+/**
+ * Expose `createApplication()`.
+ */
+
+exports = module.exports = createApplication;
+
+/**
+ * Create an express application.
+ *
+ * @return {Function}
+ * @api public
+ */
+
+function createApplication() {
+  var app = function(req, res, next) {
+    app.handle(req, res, next);
+  };
+
+  mixin(app, EventEmitter.prototype, false);
+  mixin(app, proto, false);
+
+  app.request = { __proto__: req, app: app };
+  app.response = { __proto__: res, app: app };
+  app.init();
+  return app;
+}
+
+/**
+ * Expose the prototypes.
+ */
+
+exports.application = proto;
+exports.request = req;
+exports.response = res;
+
+/**
+ * Expose constructors.
+ */
+
+exports.Route = Route;
+exports.Router = Router;
+
+/**
+ * Expose middleware
+ */
+
+exports.query = require('./middleware/query');
+exports.static = require('serve-static');
+
+/**
+ * Replace removed middleware with an appropriate error message.
+ */
+
+[
+  'json',
+  'urlencoded',
+  'bodyParser',
+  'compress',
+  'cookieSession',
+  'session',
+  'logger',
+  'cookieParser',
+  'favicon',
+  'responseTime',
+  'errorHandler',
+  'timeout',
+  'methodOverride',
+  'vhost',
+  'csrf',
+  'directory',
+  'limit',
+  'multipart',
+  'staticCache',
+].forEach(function (name) {
+  Object.defineProperty(exports, name, {
+    get: function () {
+      throw new Error('Most middleware (like ' + name + ') is no longer bundled with Express and must be installed separately. Please see https://github.com/senchalabs/connect#middleware.');
+    },
+    configurable: true
+  });
+});
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/init.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/init.js
new file mode 100644
index 0000000..f3119ed
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/init.js
@@ -0,0 +1,36 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Initialization middleware, exposing the
+ * request and response to each other, as well
+ * as defaulting the X-Powered-By header field.
+ *
+ * @param {Function} app
+ * @return {Function}
+ * @api private
+ */
+
+exports.init = function(app){
+  return function expressInit(req, res, next){
+    if (app.enabled('x-powered-by')) res.setHeader('X-Powered-By', 'Express');
+    req.res = res;
+    res.req = req;
+    req.next = next;
+
+    req.__proto__ = app.request;
+    res.__proto__ = app.response;
+
+    res.locals = res.locals || Object.create(null);
+
+    next();
+  };
+};
+
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/query.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/query.js
new file mode 100644
index 0000000..5f76f84
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/middleware/query.js
@@ -0,0 +1,46 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+var parseUrl = require('parseurl');
+var qs = require('qs');
+
+/**
+ * @param {Object} options
+ * @return {Function}
+ * @api public
+ */
+
+module.exports = function query(options) {
+  var opts = Object.create(options || null);
+  var queryparse = qs.parse;
+
+  if (typeof options === 'function') {
+    queryparse = options;
+    opts = undefined;
+  }
+
+  if (opts !== undefined && opts.allowPrototypes === undefined) {
+    // back-compat for qs module
+    opts.allowPrototypes = true;
+  }
+
+  return function query(req, res, next){
+    if (!req.query) {
+      var val = parseUrl(req).query;
+      req.query = queryparse(val, opts);
+    }
+
+    next();
+  };
+};
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/request.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/request.js
new file mode 100644
index 0000000..557d050
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/request.js
@@ -0,0 +1,502 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var accepts = require('accepts');
+var deprecate = require('depd')('express');
+var isIP = require('net').isIP;
+var typeis = require('type-is');
+var http = require('http');
+var fresh = require('fresh');
+var parseRange = require('range-parser');
+var parse = require('parseurl');
+var proxyaddr = require('proxy-addr');
+
+/**
+ * Request prototype.
+ */
+
+var req = exports = module.exports = {
+  __proto__: http.IncomingMessage.prototype
+};
+
+/**
+ * Return request header.
+ *
+ * The `Referrer` header field is special-cased,
+ * both `Referrer` and `Referer` are interchangeable.
+ *
+ * Examples:
+ *
+ *     req.get('Content-Type');
+ *     // => "text/plain"
+ *
+ *     req.get('content-type');
+ *     // => "text/plain"
+ *
+ *     req.get('Something');
+ *     // => undefined
+ *
+ * Aliased as `req.header()`.
+ *
+ * @param {String} name
+ * @return {String}
+ * @public
+ */
+
+req.get =
+req.header = function header(name) {
+  if (!name) {
+    throw new TypeError('name argument is required to req.get');
+  }
+
+  if (typeof name !== 'string') {
+    throw new TypeError('name must be a string to req.get');
+  }
+
+  var lc = name.toLowerCase();
+
+  switch (lc) {
+    case 'referer':
+    case 'referrer':
+      return this.headers.referrer
+        || this.headers.referer;
+    default:
+      return this.headers[lc];
+  }
+};
+
+/**
+ * To do: update docs.
+ *
+ * Check if the given `type(s)` is acceptable, returning
+ * the best match when true, otherwise `undefined`, in which
+ * case you should respond with 406 "Not Acceptable".
+ *
+ * The `type` value may be a single MIME type string
+ * such as "application/json", an extension name
+ * such as "json", a comma-delimited list such as "json, html, text/plain",
+ * an argument list such as `"json", "html", "text/plain"`,
+ * or an array `["json", "html", "text/plain"]`. When a list
+ * or array is given, the _best_ match, if any is returned.
+ *
+ * Examples:
+ *
+ *     // Accept: text/html
+ *     req.accepts('html');
+ *     // => "html"
+ *
+ *     // Accept: text/*, application/json
+ *     req.accepts('html');
+ *     // => "html"
+ *     req.accepts('text/html');
+ *     // => "text/html"
+ *     req.accepts('json, text');
+ *     // => "json"
+ *     req.accepts('application/json');
+ *     // => "application/json"
+ *
+ *     // Accept: text/*, application/json
+ *     req.accepts('image/png');
+ *     req.accepts('png');
+ *     // => undefined
+ *
+ *     // Accept: text/*;q=.5, application/json
+ *     req.accepts(['html', 'json']);
+ *     req.accepts('html', 'json');
+ *     req.accepts('html, json');
+ *     // => "json"
+ *
+ * @param {String|Array} type(s)
+ * @return {String|Array|Boolean}
+ * @public
+ */
+
+req.accepts = function(){
+  var accept = accepts(this);
+  return accept.types.apply(accept, arguments);
+};
+
+/**
+ * Check if the given `encoding`s are accepted.
+ *
+ * @param {String} ...encoding
+ * @return {String|Array}
+ * @public
+ */
+
+req.acceptsEncodings = function(){
+  var accept = accepts(this);
+  return accept.encodings.apply(accept, arguments);
+};
+
+req.acceptsEncoding = deprecate.function(req.acceptsEncodings,
+  'req.acceptsEncoding: Use acceptsEncodings instead');
+
+/**
+ * Check if the given `charset`s are acceptable,
+ * otherwise you should respond with 406 "Not Acceptable".
+ *
+ * @param {String} ...charset
+ * @return {String|Array}
+ * @public
+ */
+
+req.acceptsCharsets = function(){
+  var accept = accepts(this);
+  return accept.charsets.apply(accept, arguments);
+};
+
+req.acceptsCharset = deprecate.function(req.acceptsCharsets,
+  'req.acceptsCharset: Use acceptsCharsets instead');
+
+/**
+ * Check if the given `lang`s are acceptable,
+ * otherwise you should respond with 406 "Not Acceptable".
+ *
+ * @param {String} ...lang
+ * @return {String|Array}
+ * @public
+ */
+
+req.acceptsLanguages = function(){
+  var accept = accepts(this);
+  return accept.languages.apply(accept, arguments);
+};
+
+req.acceptsLanguage = deprecate.function(req.acceptsLanguages,
+  'req.acceptsLanguage: Use acceptsLanguages instead');
+
+/**
+ * Parse Range header field, capping to the given `size`.
+ *
+ * Unspecified ranges such as "0-" require knowledge of your resource length. In
+ * the case of a byte range this is of course the total number of bytes. If the
+ * Range header field is not given `undefined` is returned, `-1` when unsatisfiable,
+ * and `-2` when syntactically invalid.
+ *
+ * When ranges are returned, the array has a "type" property which is the type of
+ * range that is required (most commonly, "bytes"). Each array element is an object
+ * with a "start" and "end" property for the portion of the range.
+ *
+ * The "combine" option can be set to `true` and overlapping & adjacent ranges
+ * will be combined into a single range.
+ *
+ * NOTE: remember that ranges are inclusive, so for example "Range: users=0-3"
+ * should respond with 4 users when available, not 3.
+ *
+ * @param {number} size
+ * @param {object} [options]
+ * @param {boolean} [options.combine=false]
+ * @return {number|array}
+ * @public
+ */
+
+req.range = function range(size, options) {
+  var range = this.get('Range');
+  if (!range) return;
+  return parseRange(size, range, options);
+};
+
+/**
+ * Return the value of param `name` when present or `defaultValue`.
+ *
+ *  - Checks route placeholders, ex: _/user/:id_
+ *  - Checks body params, ex: id=12, {"id":12}
+ *  - Checks query string params, ex: ?id=12
+ *
+ * To utilize request bodies, `req.body`
+ * should be an object. This can be done by using
+ * the `bodyParser()` middleware.
+ *
+ * @param {String} name
+ * @param {Mixed} [defaultValue]
+ * @return {String}
+ * @public
+ */
+
+req.param = function param(name, defaultValue) {
+  var params = this.params || {};
+  var body = this.body || {};
+  var query = this.query || {};
+
+  var args = arguments.length === 1
+    ? 'name'
+    : 'name, default';
+  deprecate('req.param(' + args + '): Use req.params, req.body, or req.query instead');
+
+  if (null != params[name] && params.hasOwnProperty(name)) return params[name];
+  if (null != body[name]) return body[name];
+  if (null != query[name]) return query[name];
+
+  return defaultValue;
+};
+
+/**
+ * Check if the incoming request contains the "Content-Type"
+ * header field, and it contains the give mime `type`.
+ *
+ * Examples:
+ *
+ *      // With Content-Type: text/html; charset=utf-8
+ *      req.is('html');
+ *      req.is('text/html');
+ *      req.is('text/*');
+ *      // => true
+ *
+ *      // When Content-Type is application/json
+ *      req.is('json');
+ *      req.is('application/json');
+ *      req.is('application/*');
+ *      // => true
+ *
+ *      req.is('html');
+ *      // => false
+ *
+ * @param {String|Array} types...
+ * @return {String|false|null}
+ * @public
+ */
+
+req.is = function is(types) {
+  var arr = types;
+
+  // support flattened arguments
+  if (!Array.isArray(types)) {
+    arr = new Array(arguments.length);
+    for (var i = 0; i < arr.length; i++) {
+      arr[i] = arguments[i];
+    }
+  }
+
+  return typeis(this, arr);
+};
+
+/**
+ * Return the protocol string "http" or "https"
+ * when requested with TLS. When the "trust proxy"
+ * setting trusts the socket address, the
+ * "X-Forwarded-Proto" header field will be trusted
+ * and used if present.
+ *
+ * If you're running behind a reverse proxy that
+ * supplies https for you this may be enabled.
+ *
+ * @return {String}
+ * @public
+ */
+
+defineGetter(req, 'protocol', function protocol(){
+  var proto = this.connection.encrypted
+    ? 'https'
+    : 'http';
+  var trust = this.app.get('trust proxy fn');
+
+  if (!trust(this.connection.remoteAddress, 0)) {
+    return proto;
+  }
+
+  // Note: X-Forwarded-Proto is normally only ever a
+  //       single value, but this is to be safe.
+  proto = this.get('X-Forwarded-Proto') || proto;
+  return proto.split(/\s*,\s*/)[0];
+});
+
+/**
+ * Short-hand for:
+ *
+ *    req.protocol === 'https'
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+defineGetter(req, 'secure', function secure(){
+  return this.protocol === 'https';
+});
+
+/**
+ * Return the remote address from the trusted proxy.
+ *
+ * The is the remote address on the socket unless
+ * "trust proxy" is set.
+ *
+ * @return {String}
+ * @public
+ */
+
+defineGetter(req, 'ip', function ip(){
+  var trust = this.app.get('trust proxy fn');
+  return proxyaddr(this, trust);
+});
+
+/**
+ * When "trust proxy" is set, trusted proxy addresses + client.
+ *
+ * For example if the value were "client, proxy1, proxy2"
+ * you would receive the array `["client", "proxy1", "proxy2"]`
+ * where "proxy2" is the furthest down-stream and "proxy1" and
+ * "proxy2" were trusted.
+ *
+ * @return {Array}
+ * @public
+ */
+
+defineGetter(req, 'ips', function ips() {
+  var trust = this.app.get('trust proxy fn');
+  var addrs = proxyaddr.all(this, trust);
+  return addrs.slice(1).reverse();
+});
+
+/**
+ * Return subdomains as an array.
+ *
+ * Subdomains are the dot-separated parts of the host before the main domain of
+ * the app. By default, the domain of the app is assumed to be the last two
+ * parts of the host. This can be changed by setting "subdomain offset".
+ *
+ * For example, if the domain is "tobi.ferrets.example.com":
+ * If "subdomain offset" is not set, req.subdomains is `["ferrets", "tobi"]`.
+ * If "subdomain offset" is 3, req.subdomains is `["tobi"]`.
+ *
+ * @return {Array}
+ * @public
+ */
+
+defineGetter(req, 'subdomains', function subdomains() {
+  var hostname = this.hostname;
+
+  if (!hostname) return [];
+
+  var offset = this.app.get('subdomain offset');
+  var subdomains = !isIP(hostname)
+    ? hostname.split('.').reverse()
+    : [hostname];
+
+  return subdomains.slice(offset);
+});
+
+/**
+ * Short-hand for `url.parse(req.url).pathname`.
+ *
+ * @return {String}
+ * @public
+ */
+
+defineGetter(req, 'path', function path() {
+  return parse(this).pathname;
+});
+
+/**
+ * Parse the "Host" header field to a hostname.
+ *
+ * When the "trust proxy" setting trusts the socket
+ * address, the "X-Forwarded-Host" header field will
+ * be trusted.
+ *
+ * @return {String}
+ * @public
+ */
+
+defineGetter(req, 'hostname', function hostname(){
+  var trust = this.app.get('trust proxy fn');
+  var host = this.get('X-Forwarded-Host');
+
+  if (!host || !trust(this.connection.remoteAddress, 0)) {
+    host = this.get('Host');
+  }
+
+  if (!host) return;
+
+  // IPv6 literal support
+  var offset = host[0] === '['
+    ? host.indexOf(']') + 1
+    : 0;
+  var index = host.indexOf(':', offset);
+
+  return index !== -1
+    ? host.substring(0, index)
+    : host;
+});
+
+// TODO: change req.host to return host in next major
+
+defineGetter(req, 'host', deprecate.function(function host(){
+  return this.hostname;
+}, 'req.host: Use req.hostname instead'));
+
+/**
+ * Check if the request is fresh, aka
+ * Last-Modified and/or the ETag
+ * still match.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+defineGetter(req, 'fresh', function(){
+  var method = this.method;
+  var s = this.res.statusCode;
+
+  // GET or HEAD for weak freshness validation only
+  if ('GET' !== method && 'HEAD' !== method) return false;
+
+  // 2xx or 304 as per rfc2616 14.26
+  if ((s >= 200 && s < 300) || 304 === s) {
+    return fresh(this.headers, (this.res._headers || {}));
+  }
+
+  return false;
+});
+
+/**
+ * Check if the request is stale, aka
+ * "Last-Modified" and / or the "ETag" for the
+ * resource has changed.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+defineGetter(req, 'stale', function stale(){
+  return !this.fresh;
+});
+
+/**
+ * Check if the request was an _XMLHttpRequest_.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+defineGetter(req, 'xhr', function xhr(){
+  var val = this.get('X-Requested-With') || '';
+  return val.toLowerCase() === 'xmlhttprequest';
+});
+
+/**
+ * Helper function for creating a getter on an object.
+ *
+ * @param {Object} obj
+ * @param {String} name
+ * @param {Function} getter
+ * @private
+ */
+function defineGetter(obj, name, getter) {
+  Object.defineProperty(obj, name, {
+    configurable: true,
+    enumerable: true,
+    get: getter
+  });
+};
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/response.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/response.js
new file mode 100644
index 0000000..6128f45
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/response.js
@@ -0,0 +1,1065 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var contentDisposition = require('content-disposition');
+var deprecate = require('depd')('express');
+var encodeUrl = require('encodeurl');
+var escapeHtml = require('escape-html');
+var http = require('http');
+var isAbsolute = require('./utils').isAbsolute;
+var onFinished = require('on-finished');
+var path = require('path');
+var merge = require('utils-merge');
+var sign = require('cookie-signature').sign;
+var normalizeType = require('./utils').normalizeType;
+var normalizeTypes = require('./utils').normalizeTypes;
+var setCharset = require('./utils').setCharset;
+var statusCodes = http.STATUS_CODES;
+var cookie = require('cookie');
+var send = require('send');
+var extname = path.extname;
+var mime = send.mime;
+var resolve = path.resolve;
+var vary = require('vary');
+
+/**
+ * Response prototype.
+ */
+
+var res = module.exports = {
+  __proto__: http.ServerResponse.prototype
+};
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var charsetRegExp = /;\s*charset\s*=/;
+
+/**
+ * Set status `code`.
+ *
+ * @param {Number} code
+ * @return {ServerResponse}
+ * @public
+ */
+
+res.status = function status(code) {
+  this.statusCode = code;
+  return this;
+};
+
+/**
+ * Set Link header field with the given `links`.
+ *
+ * Examples:
+ *
+ *    res.links({
+ *      next: 'http://api.example.com/users?page=2',
+ *      last: 'http://api.example.com/users?page=5'
+ *    });
+ *
+ * @param {Object} links
+ * @return {ServerResponse}
+ * @public
+ */
+
+res.links = function(links){
+  var link = this.get('Link') || '';
+  if (link) link += ', ';
+  return this.set('Link', link + Object.keys(links).map(function(rel){
+    return '<' + links[rel] + '>; rel="' + rel + '"';
+  }).join(', '));
+};
+
+/**
+ * Send a response.
+ *
+ * Examples:
+ *
+ *     res.send(new Buffer('wahoo'));
+ *     res.send({ some: 'json' });
+ *     res.send('<p>some html</p>');
+ *
+ * @param {string|number|boolean|object|Buffer} body
+ * @public
+ */
+
+res.send = function send(body) {
+  var chunk = body;
+  var encoding;
+  var len;
+  var req = this.req;
+  var type;
+
+  // settings
+  var app = this.app;
+
+  // allow status / body
+  if (arguments.length === 2) {
+    // res.send(body, status) backwards compat
+    if (typeof arguments[0] !== 'number' && typeof arguments[1] === 'number') {
+      deprecate('res.send(body, status): Use res.status(status).send(body) instead');
+      this.statusCode = arguments[1];
+    } else {
+      deprecate('res.send(status, body): Use res.status(status).send(body) instead');
+      this.statusCode = arguments[0];
+      chunk = arguments[1];
+    }
+  }
+
+  // disambiguate res.send(status) and res.send(status, num)
+  if (typeof chunk === 'number' && arguments.length === 1) {
+    // res.send(status) will set status message as text string
+    if (!this.get('Content-Type')) {
+      this.type('txt');
+    }
+
+    deprecate('res.send(status): Use res.sendStatus(status) instead');
+    this.statusCode = chunk;
+    chunk = statusCodes[chunk];
+  }
+
+  switch (typeof chunk) {
+    // string defaulting to html
+    case 'string':
+      if (!this.get('Content-Type')) {
+        this.type('html');
+      }
+      break;
+    case 'boolean':
+    case 'number':
+    case 'object':
+      if (chunk === null) {
+        chunk = '';
+      } else if (Buffer.isBuffer(chunk)) {
+        if (!this.get('Content-Type')) {
+          this.type('bin');
+        }
+      } else {
+        return this.json(chunk);
+      }
+      break;
+  }
+
+  // write strings in utf-8
+  if (typeof chunk === 'string') {
+    encoding = 'utf8';
+    type = this.get('Content-Type');
+
+    // reflect this in content-type
+    if (typeof type === 'string') {
+      this.set('Content-Type', setCharset(type, 'utf-8'));
+    }
+  }
+
+  // populate Content-Length
+  if (chunk !== undefined) {
+    if (!Buffer.isBuffer(chunk)) {
+      // convert chunk to Buffer; saves later double conversions
+      chunk = new Buffer(chunk, encoding);
+      encoding = undefined;
+    }
+
+    len = chunk.length;
+    this.set('Content-Length', len);
+  }
+
+  // populate ETag
+  var etag;
+  var generateETag = len !== undefined && app.get('etag fn');
+  if (typeof generateETag === 'function' && !this.get('ETag')) {
+    if ((etag = generateETag(chunk, encoding))) {
+      this.set('ETag', etag);
+    }
+  }
+
+  // freshness
+  if (req.fresh) this.statusCode = 304;
+
+  // strip irrelevant headers
+  if (204 === this.statusCode || 304 === this.statusCode) {
+    this.removeHeader('Content-Type');
+    this.removeHeader('Content-Length');
+    this.removeHeader('Transfer-Encoding');
+    chunk = '';
+  }
+
+  if (req.method === 'HEAD') {
+    // skip body for HEAD
+    this.end();
+  } else {
+    // respond
+    this.end(chunk, encoding);
+  }
+
+  return this;
+};
+
+/**
+ * Send JSON response.
+ *
+ * Examples:
+ *
+ *     res.json(null);
+ *     res.json({ user: 'tj' });
+ *
+ * @param {string|number|boolean|object} obj
+ * @public
+ */
+
+res.json = function json(obj) {
+  var val = obj;
+
+  // allow status / body
+  if (arguments.length === 2) {
+    // res.json(body, status) backwards compat
+    if (typeof arguments[1] === 'number') {
+      deprecate('res.json(obj, status): Use res.status(status).json(obj) instead');
+      this.statusCode = arguments[1];
+    } else {
+      deprecate('res.json(status, obj): Use res.status(status).json(obj) instead');
+      this.statusCode = arguments[0];
+      val = arguments[1];
+    }
+  }
+
+  // settings
+  var app = this.app;
+  var replacer = app.get('json replacer');
+  var spaces = app.get('json spaces');
+  var body = stringify(val, replacer, spaces);
+
+  // content-type
+  if (!this.get('Content-Type')) {
+    this.set('Content-Type', 'application/json');
+  }
+
+  return this.send(body);
+};
+
+/**
+ * Send JSON response with JSONP callback support.
+ *
+ * Examples:
+ *
+ *     res.jsonp(null);
+ *     res.jsonp({ user: 'tj' });
+ *
+ * @param {string|number|boolean|object} obj
+ * @public
+ */
+
+res.jsonp = function jsonp(obj) {
+  var val = obj;
+
+  // allow status / body
+  if (arguments.length === 2) {
+    // res.json(body, status) backwards compat
+    if (typeof arguments[1] === 'number') {
+      deprecate('res.jsonp(obj, status): Use res.status(status).json(obj) instead');
+      this.statusCode = arguments[1];
+    } else {
+      deprecate('res.jsonp(status, obj): Use res.status(status).jsonp(obj) instead');
+      this.statusCode = arguments[0];
+      val = arguments[1];
+    }
+  }
+
+  // settings
+  var app = this.app;
+  var replacer = app.get('json replacer');
+  var spaces = app.get('json spaces');
+  var body = stringify(val, replacer, spaces);
+  var callback = this.req.query[app.get('jsonp callback name')];
+
+  // content-type
+  if (!this.get('Content-Type')) {
+    this.set('X-Content-Type-Options', 'nosniff');
+    this.set('Content-Type', 'application/json');
+  }
+
+  // fixup callback
+  if (Array.isArray(callback)) {
+    callback = callback[0];
+  }
+
+  // jsonp
+  if (typeof callback === 'string' && callback.length !== 0) {
+    this.charset = 'utf-8';
+    this.set('X-Content-Type-Options', 'nosniff');
+    this.set('Content-Type', 'text/javascript');
+
+    // restrict callback charset
+    callback = callback.replace(/[^\[\]\w$.]/g, '');
+
+    // replace chars not allowed in JavaScript that are in JSON
+    body = body
+      .replace(/\u2028/g, '\\u2028')
+      .replace(/\u2029/g, '\\u2029');
+
+    // the /**/ is a specific security mitigation for "Rosetta Flash JSONP abuse"
+    // the typeof check is just to reduce client error noise
+    body = '/**/ typeof ' + callback + ' === \'function\' && ' + callback + '(' + body + ');';
+  }
+
+  return this.send(body);
+};
+
+/**
+ * Send given HTTP status code.
+ *
+ * Sets the response status to `statusCode` and the body of the
+ * response to the standard description from node's http.STATUS_CODES
+ * or the statusCode number if no description.
+ *
+ * Examples:
+ *
+ *     res.sendStatus(200);
+ *
+ * @param {number} statusCode
+ * @public
+ */
+
+res.sendStatus = function sendStatus(statusCode) {
+  var body = statusCodes[statusCode] || String(statusCode);
+
+  this.statusCode = statusCode;
+  this.type('txt');
+
+  return this.send(body);
+};
+
+/**
+ * Transfer the file at the given `path`.
+ *
+ * Automatically sets the _Content-Type_ response header field.
+ * The callback `callback(err)` is invoked when the transfer is complete
+ * or when an error occurs. Be sure to check `res.sentHeader`
+ * if you wish to attempt responding, as the header and some data
+ * may have already been transferred.
+ *
+ * Options:
+ *
+ *   - `maxAge`   defaulting to 0 (can be string converted by `ms`)
+ *   - `root`     root directory for relative filenames
+ *   - `headers`  object of headers to serve with file
+ *   - `dotfiles` serve dotfiles, defaulting to false; can be `"allow"` to send them
+ *
+ * Other options are passed along to `send`.
+ *
+ * Examples:
+ *
+ *  The following example illustrates how `res.sendFile()` may
+ *  be used as an alternative for the `static()` middleware for
+ *  dynamic situations. The code backing `res.sendFile()` is actually
+ *  the same code, so HTTP cache support etc is identical.
+ *
+ *     app.get('/user/:uid/photos/:file', function(req, res){
+ *       var uid = req.params.uid
+ *         , file = req.params.file;
+ *
+ *       req.user.mayViewFilesFrom(uid, function(yes){
+ *         if (yes) {
+ *           res.sendFile('/uploads/' + uid + '/' + file);
+ *         } else {
+ *           res.send(403, 'Sorry! you cant see that.');
+ *         }
+ *       });
+ *     });
+ *
+ * @public
+ */
+
+res.sendFile = function sendFile(path, options, callback) {
+  var done = callback;
+  var req = this.req;
+  var res = this;
+  var next = req.next;
+  var opts = options || {};
+
+  if (!path) {
+    throw new TypeError('path argument is required to res.sendFile');
+  }
+
+  // support function as second arg
+  if (typeof options === 'function') {
+    done = options;
+    opts = {};
+  }
+
+  if (!opts.root && !isAbsolute(path)) {
+    throw new TypeError('path must be absolute or specify root to res.sendFile');
+  }
+
+  // create file stream
+  var pathname = encodeURI(path);
+  var file = send(req, pathname, opts);
+
+  // transfer
+  sendfile(res, file, opts, function (err) {
+    if (done) return done(err);
+    if (err && err.code === 'EISDIR') return next();
+
+    // next() all but write errors
+    if (err && err.code !== 'ECONNABORTED' && err.syscall !== 'write') {
+      next(err);
+    }
+  });
+};
+
+/**
+ * Transfer the file at the given `path`.
+ *
+ * Automatically sets the _Content-Type_ response header field.
+ * The callback `callback(err)` is invoked when the transfer is complete
+ * or when an error occurs. Be sure to check `res.sentHeader`
+ * if you wish to attempt responding, as the header and some data
+ * may have already been transferred.
+ *
+ * Options:
+ *
+ *   - `maxAge`   defaulting to 0 (can be string converted by `ms`)
+ *   - `root`     root directory for relative filenames
+ *   - `headers`  object of headers to serve with file
+ *   - `dotfiles` serve dotfiles, defaulting to false; can be `"allow"` to send them
+ *
+ * Other options are passed along to `send`.
+ *
+ * Examples:
+ *
+ *  The following example illustrates how `res.sendfile()` may
+ *  be used as an alternative for the `static()` middleware for
+ *  dynamic situations. The code backing `res.sendfile()` is actually
+ *  the same code, so HTTP cache support etc is identical.
+ *
+ *     app.get('/user/:uid/photos/:file', function(req, res){
+ *       var uid = req.params.uid
+ *         , file = req.params.file;
+ *
+ *       req.user.mayViewFilesFrom(uid, function(yes){
+ *         if (yes) {
+ *           res.sendfile('/uploads/' + uid + '/' + file);
+ *         } else {
+ *           res.send(403, 'Sorry! you cant see that.');
+ *         }
+ *       });
+ *     });
+ *
+ * @public
+ */
+
+res.sendfile = function (path, options, callback) {
+  var done = callback;
+  var req = this.req;
+  var res = this;
+  var next = req.next;
+  var opts = options || {};
+
+  // support function as second arg
+  if (typeof options === 'function') {
+    done = options;
+    opts = {};
+  }
+
+  // create file stream
+  var file = send(req, path, opts);
+
+  // transfer
+  sendfile(res, file, opts, function (err) {
+    if (done) return done(err);
+    if (err && err.code === 'EISDIR') return next();
+
+    // next() all but write errors
+    if (err && err.code !== 'ECONNABORT' && err.syscall !== 'write') {
+      next(err);
+    }
+  });
+};
+
+res.sendfile = deprecate.function(res.sendfile,
+  'res.sendfile: Use res.sendFile instead');
+
+/**
+ * Transfer the file at the given `path` as an attachment.
+ *
+ * Optionally providing an alternate attachment `filename`,
+ * and optional callback `callback(err)`. The callback is invoked
+ * when the data transfer is complete, or when an error has
+ * ocurred. Be sure to check `res.headersSent` if you plan to respond.
+ *
+ * This method uses `res.sendfile()`.
+ *
+ * @public
+ */
+
+res.download = function download(path, filename, callback) {
+  var done = callback;
+  var name = filename;
+
+  // support function as second arg
+  if (typeof filename === 'function') {
+    done = filename;
+    name = null;
+  }
+
+  // set Content-Disposition when file is sent
+  var headers = {
+    'Content-Disposition': contentDisposition(name || path)
+  };
+
+  // Resolve the full path for sendFile
+  var fullPath = resolve(path);
+
+  return this.sendFile(fullPath, { headers: headers }, done);
+};
+
+/**
+ * Set _Content-Type_ response header with `type` through `mime.lookup()`
+ * when it does not contain "/", or set the Content-Type to `type` otherwise.
+ *
+ * Examples:
+ *
+ *     res.type('.html');
+ *     res.type('html');
+ *     res.type('json');
+ *     res.type('application/json');
+ *     res.type('png');
+ *
+ * @param {String} type
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.contentType =
+res.type = function contentType(type) {
+  var ct = type.indexOf('/') === -1
+    ? mime.lookup(type)
+    : type;
+
+  return this.set('Content-Type', ct);
+};
+
+/**
+ * Respond to the Acceptable formats using an `obj`
+ * of mime-type callbacks.
+ *
+ * This method uses `req.accepted`, an array of
+ * acceptable types ordered by their quality values.
+ * When "Accept" is not present the _first_ callback
+ * is invoked, otherwise the first match is used. When
+ * no match is performed the server responds with
+ * 406 "Not Acceptable".
+ *
+ * Content-Type is set for you, however if you choose
+ * you may alter this within the callback using `res.type()`
+ * or `res.set('Content-Type', ...)`.
+ *
+ *    res.format({
+ *      'text/plain': function(){
+ *        res.send('hey');
+ *      },
+ *
+ *      'text/html': function(){
+ *        res.send('<p>hey</p>');
+ *      },
+ *
+ *      'appliation/json': function(){
+ *        res.send({ message: 'hey' });
+ *      }
+ *    });
+ *
+ * In addition to canonicalized MIME types you may
+ * also use extnames mapped to these types:
+ *
+ *    res.format({
+ *      text: function(){
+ *        res.send('hey');
+ *      },
+ *
+ *      html: function(){
+ *        res.send('<p>hey</p>');
+ *      },
+ *
+ *      json: function(){
+ *        res.send({ message: 'hey' });
+ *      }
+ *    });
+ *
+ * By default Express passes an `Error`
+ * with a `.status` of 406 to `next(err)`
+ * if a match is not made. If you provide
+ * a `.default` callback it will be invoked
+ * instead.
+ *
+ * @param {Object} obj
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.format = function(obj){
+  var req = this.req;
+  var next = req.next;
+
+  var fn = obj.default;
+  if (fn) delete obj.default;
+  var keys = Object.keys(obj);
+
+  var key = keys.length > 0
+    ? req.accepts(keys)
+    : false;
+
+  this.vary("Accept");
+
+  if (key) {
+    this.set('Content-Type', normalizeType(key).value);
+    obj[key](req, this, next);
+  } else if (fn) {
+    fn();
+  } else {
+    var err = new Error('Not Acceptable');
+    err.status = err.statusCode = 406;
+    err.types = normalizeTypes(keys).map(function(o){ return o.value });
+    next(err);
+  }
+
+  return this;
+};
+
+/**
+ * Set _Content-Disposition_ header to _attachment_ with optional `filename`.
+ *
+ * @param {String} filename
+ * @return {ServerResponse}
+ * @public
+ */
+
+res.attachment = function attachment(filename) {
+  if (filename) {
+    this.type(extname(filename));
+  }
+
+  this.set('Content-Disposition', contentDisposition(filename));
+
+  return this;
+};
+
+/**
+ * Append additional header `field` with value `val`.
+ *
+ * Example:
+ *
+ *    res.append('Link', ['<http://localhost/>', '<http://localhost:3000/>']);
+ *    res.append('Set-Cookie', 'foo=bar; Path=/; HttpOnly');
+ *    res.append('Warning', '199 Miscellaneous warning');
+ *
+ * @param {String} field
+ * @param {String|Array} val
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.append = function append(field, val) {
+  var prev = this.get(field);
+  var value = val;
+
+  if (prev) {
+    // concat the new and prev vals
+    value = Array.isArray(prev) ? prev.concat(val)
+      : Array.isArray(val) ? [prev].concat(val)
+      : [prev, val];
+  }
+
+  return this.set(field, value);
+};
+
+/**
+ * Set header `field` to `val`, or pass
+ * an object of header fields.
+ *
+ * Examples:
+ *
+ *    res.set('Foo', ['bar', 'baz']);
+ *    res.set('Accept', 'application/json');
+ *    res.set({ Accept: 'text/plain', 'X-API-Key': 'tobi' });
+ *
+ * Aliased as `res.header()`.
+ *
+ * @param {String|Object} field
+ * @param {String|Array} val
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.set =
+res.header = function header(field, val) {
+  if (arguments.length === 2) {
+    var value = Array.isArray(val)
+      ? val.map(String)
+      : String(val);
+
+    // add charset to content-type
+    if (field.toLowerCase() === 'content-type' && !charsetRegExp.test(value)) {
+      var charset = mime.charsets.lookup(value.split(';')[0]);
+      if (charset) value += '; charset=' + charset.toLowerCase();
+    }
+
+    this.setHeader(field, value);
+  } else {
+    for (var key in field) {
+      this.set(key, field[key]);
+    }
+  }
+  return this;
+};
+
+/**
+ * Get value for header `field`.
+ *
+ * @param {String} field
+ * @return {String}
+ * @public
+ */
+
+res.get = function(field){
+  return this.getHeader(field);
+};
+
+/**
+ * Clear cookie `name`.
+ *
+ * @param {String} name
+ * @param {Object} [options]
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.clearCookie = function clearCookie(name, options) {
+  var opts = merge({ expires: new Date(1), path: '/' }, options);
+
+  return this.cookie(name, '', opts);
+};
+
+/**
+ * Set cookie `name` to `value`, with the given `options`.
+ *
+ * Options:
+ *
+ *    - `maxAge`   max-age in milliseconds, converted to `expires`
+ *    - `signed`   sign the cookie
+ *    - `path`     defaults to "/"
+ *
+ * Examples:
+ *
+ *    // "Remember Me" for 15 minutes
+ *    res.cookie('rememberme', '1', { expires: new Date(Date.now() + 900000), httpOnly: true });
+ *
+ *    // save as above
+ *    res.cookie('rememberme', '1', { maxAge: 900000, httpOnly: true })
+ *
+ * @param {String} name
+ * @param {String|Object} value
+ * @param {Options} options
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.cookie = function (name, value, options) {
+  var opts = merge({}, options);
+  var secret = this.req.secret;
+  var signed = opts.signed;
+
+  if (signed && !secret) {
+    throw new Error('cookieParser("secret") required for signed cookies');
+  }
+
+  var val = typeof value === 'object'
+    ? 'j:' + JSON.stringify(value)
+    : String(value);
+
+  if (signed) {
+    val = 's:' + sign(val, secret);
+  }
+
+  if ('maxAge' in opts) {
+    opts.expires = new Date(Date.now() + opts.maxAge);
+    opts.maxAge /= 1000;
+  }
+
+  if (opts.path == null) {
+    opts.path = '/';
+  }
+
+  this.append('Set-Cookie', cookie.serialize(name, String(val), opts));
+
+  return this;
+};
+
+/**
+ * Set the location header to `url`.
+ *
+ * The given `url` can also be "back", which redirects
+ * to the _Referrer_ or _Referer_ headers or "/".
+ *
+ * Examples:
+ *
+ *    res.location('/foo/bar').;
+ *    res.location('http://example.com');
+ *    res.location('../login');
+ *
+ * @param {String} url
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.location = function location(url) {
+  var loc = url;
+
+  // "back" is an alias for the referrer
+  if (url === 'back') {
+    loc = this.req.get('Referrer') || '/';
+  }
+
+  // set location
+  return this.set('Location', encodeUrl(loc));
+};
+
+/**
+ * Redirect to the given `url` with optional response `status`
+ * defaulting to 302.
+ *
+ * The resulting `url` is determined by `res.location()`, so
+ * it will play nicely with mounted apps, relative paths,
+ * `"back"` etc.
+ *
+ * Examples:
+ *
+ *    res.redirect('/foo/bar');
+ *    res.redirect('http://example.com');
+ *    res.redirect(301, 'http://example.com');
+ *    res.redirect('../login'); // /blog/post/1 -> /blog/login
+ *
+ * @public
+ */
+
+res.redirect = function redirect(url) {
+  var address = url;
+  var body;
+  var status = 302;
+
+  // allow status / url
+  if (arguments.length === 2) {
+    if (typeof arguments[0] === 'number') {
+      status = arguments[0];
+      address = arguments[1];
+    } else {
+      deprecate('res.redirect(url, status): Use res.redirect(status, url) instead');
+      status = arguments[1];
+    }
+  }
+
+  // Set location header
+  address = this.location(address).get('Location');
+
+  // Support text/{plain,html} by default
+  this.format({
+    text: function(){
+      body = statusCodes[status] + '. Redirecting to ' + address;
+    },
+
+    html: function(){
+      var u = escapeHtml(address);
+      body = '<p>' + statusCodes[status] + '. Redirecting to <a href="' + u + '">' + u + '</a></p>';
+    },
+
+    default: function(){
+      body = '';
+    }
+  });
+
+  // Respond
+  this.statusCode = status;
+  this.set('Content-Length', Buffer.byteLength(body));
+
+  if (this.req.method === 'HEAD') {
+    this.end();
+  } else {
+    this.end(body);
+  }
+};
+
+/**
+ * Add `field` to Vary. If already present in the Vary set, then
+ * this call is simply ignored.
+ *
+ * @param {Array|String} field
+ * @return {ServerResponse} for chaining
+ * @public
+ */
+
+res.vary = function(field){
+  // checks for back-compat
+  if (!field || (Array.isArray(field) && !field.length)) {
+    deprecate('res.vary(): Provide a field name');
+    return this;
+  }
+
+  vary(this, field);
+
+  return this;
+};
+
+/**
+ * Render `view` with the given `options` and optional callback `fn`.
+ * When a callback function is given a response will _not_ be made
+ * automatically, otherwise a response of _200_ and _text/html_ is given.
+ *
+ * Options:
+ *
+ *  - `cache`     boolean hinting to the engine it should cache
+ *  - `filename`  filename of the view being rendered
+ *
+ * @public
+ */
+
+res.render = function render(view, options, callback) {
+  var app = this.req.app;
+  var done = callback;
+  var opts = options || {};
+  var req = this.req;
+  var self = this;
+
+  // support callback function as second arg
+  if (typeof options === 'function') {
+    done = options;
+    opts = {};
+  }
+
+  // merge res.locals
+  opts._locals = self.locals;
+
+  // default callback to respond
+  done = done || function (err, str) {
+    if (err) return req.next(err);
+    self.send(str);
+  };
+
+  // render
+  app.render(view, opts, done);
+};
+
+// pipe the send file stream
+function sendfile(res, file, options, callback) {
+  var done = false;
+  var streaming;
+
+  // request aborted
+  function onaborted() {
+    if (done) return;
+    done = true;
+
+    var err = new Error('Request aborted');
+    err.code = 'ECONNABORTED';
+    callback(err);
+  }
+
+  // directory
+  function ondirectory() {
+    if (done) return;
+    done = true;
+
+    var err = new Error('EISDIR, read');
+    err.code = 'EISDIR';
+    callback(err);
+  }
+
+  // errors
+  function onerror(err) {
+    if (done) return;
+    done = true;
+    callback(err);
+  }
+
+  // ended
+  function onend() {
+    if (done) return;
+    done = true;
+    callback();
+  }
+
+  // file
+  function onfile() {
+    streaming = false;
+  }
+
+  // finished
+  function onfinish(err) {
+    if (err && err.code === 'ECONNRESET') return onaborted();
+    if (err) return onerror(err);
+    if (done) return;
+
+    setImmediate(function () {
+      if (streaming !== false && !done) {
+        onaborted();
+        return;
+      }
+
+      if (done) return;
+      done = true;
+      callback();
+    });
+  }
+
+  // streaming
+  function onstream() {
+    streaming = true;
+  }
+
+  file.on('directory', ondirectory);
+  file.on('end', onend);
+  file.on('error', onerror);
+  file.on('file', onfile);
+  file.on('stream', onstream);
+  onFinished(res, onfinish);
+
+  if (options.headers) {
+    // set headers on successful transfer
+    file.on('headers', function headers(res) {
+      var obj = options.headers;
+      var keys = Object.keys(obj);
+
+      for (var i = 0; i < keys.length; i++) {
+        var k = keys[i];
+        res.setHeader(k, obj[k]);
+      }
+    });
+  }
+
+  // pipe
+  file.pipe(res);
+}
+
+/**
+ * Stringify JSON, like JSON.stringify, but v8 optimized.
+ * @private
+ */
+
+function stringify(value, replacer, spaces) {
+  // v8 checks arguments.length for optimizing simple call
+  // https://bugs.chromium.org/p/v8/issues/detail?id=4730
+  return replacer || spaces
+    ? JSON.stringify(value, replacer, spaces)
+    : JSON.stringify(value);
+}
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/index.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/index.js
new file mode 100644
index 0000000..dac2514
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/index.js
@@ -0,0 +1,645 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var Route = require('./route');
+var Layer = require('./layer');
+var methods = require('methods');
+var mixin = require('utils-merge');
+var debug = require('debug')('express:router');
+var deprecate = require('depd')('express');
+var flatten = require('array-flatten');
+var parseUrl = require('parseurl');
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var objectRegExp = /^\[object (\S+)\]$/;
+var slice = Array.prototype.slice;
+var toString = Object.prototype.toString;
+
+/**
+ * Initialize a new `Router` with the given `options`.
+ *
+ * @param {Object} options
+ * @return {Router} which is an callable function
+ * @public
+ */
+
+var proto = module.exports = function(options) {
+  var opts = options || {};
+
+  function router(req, res, next) {
+    router.handle(req, res, next);
+  }
+
+  // mixin Router class functions
+  router.__proto__ = proto;
+
+  router.params = {};
+  router._params = [];
+  router.caseSensitive = opts.caseSensitive;
+  router.mergeParams = opts.mergeParams;
+  router.strict = opts.strict;
+  router.stack = [];
+
+  return router;
+};
+
+/**
+ * Map the given param placeholder `name`(s) to the given callback.
+ *
+ * Parameter mapping is used to provide pre-conditions to routes
+ * which use normalized placeholders. For example a _:user_id_ parameter
+ * could automatically load a user's information from the database without
+ * any additional code,
+ *
+ * The callback uses the same signature as middleware, the only difference
+ * being that the value of the placeholder is passed, in this case the _id_
+ * of the user. Once the `next()` function is invoked, just like middleware
+ * it will continue on to execute the route, or subsequent parameter functions.
+ *
+ * Just like in middleware, you must either respond to the request or call next
+ * to avoid stalling the request.
+ *
+ *  app.param('user_id', function(req, res, next, id){
+ *    User.find(id, function(err, user){
+ *      if (err) {
+ *        return next(err);
+ *      } else if (!user) {
+ *        return next(new Error('failed to load user'));
+ *      }
+ *      req.user = user;
+ *      next();
+ *    });
+ *  });
+ *
+ * @param {String} name
+ * @param {Function} fn
+ * @return {app} for chaining
+ * @public
+ */
+
+proto.param = function param(name, fn) {
+  // param logic
+  if (typeof name === 'function') {
+    deprecate('router.param(fn): Refactor to use path params');
+    this._params.push(name);
+    return;
+  }
+
+  // apply param functions
+  var params = this._params;
+  var len = params.length;
+  var ret;
+
+  if (name[0] === ':') {
+    deprecate('router.param(' + JSON.stringify(name) + ', fn): Use router.param(' + JSON.stringify(name.substr(1)) + ', fn) instead');
+    name = name.substr(1);
+  }
+
+  for (var i = 0; i < len; ++i) {
+    if (ret = params[i](name, fn)) {
+      fn = ret;
+    }
+  }
+
+  // ensure we end up with a
+  // middleware function
+  if ('function' !== typeof fn) {
+    throw new Error('invalid param() call for ' + name + ', got ' + fn);
+  }
+
+  (this.params[name] = this.params[name] || []).push(fn);
+  return this;
+};
+
+/**
+ * Dispatch a req, res into the router.
+ * @private
+ */
+
+proto.handle = function handle(req, res, out) {
+  var self = this;
+
+  debug('dispatching %s %s', req.method, req.url);
+
+  var search = 1 + req.url.indexOf('?');
+  var pathlength = search ? search - 1 : req.url.length;
+  var fqdn = req.url[0] !== '/' && 1 + req.url.substr(0, pathlength).indexOf('://');
+  var protohost = fqdn ? req.url.substr(0, req.url.indexOf('/', 2 + fqdn)) : '';
+  var idx = 0;
+  var removed = '';
+  var slashAdded = false;
+  var paramcalled = {};
+
+  // store options for OPTIONS request
+  // only used if OPTIONS request
+  var options = [];
+
+  // middleware and routes
+  var stack = self.stack;
+
+  // manage inter-router variables
+  var parentParams = req.params;
+  var parentUrl = req.baseUrl || '';
+  var done = restore(out, req, 'baseUrl', 'next', 'params');
+
+  // setup next layer
+  req.next = next;
+
+  // for options requests, respond with a default if nothing else responds
+  if (req.method === 'OPTIONS') {
+    done = wrap(done, function(old, err) {
+      if (err || options.length === 0) return old(err);
+      sendOptionsResponse(res, options, old);
+    });
+  }
+
+  // setup basic req values
+  req.baseUrl = parentUrl;
+  req.originalUrl = req.originalUrl || req.url;
+
+  next();
+
+  function next(err) {
+    var layerError = err === 'route'
+      ? null
+      : err;
+
+    // remove added slash
+    if (slashAdded) {
+      req.url = req.url.substr(1);
+      slashAdded = false;
+    }
+
+    // restore altered req.url
+    if (removed.length !== 0) {
+      req.baseUrl = parentUrl;
+      req.url = protohost + removed + req.url.substr(protohost.length);
+      removed = '';
+    }
+
+    // no more matching layers
+    if (idx >= stack.length) {
+      setImmediate(done, layerError);
+      return;
+    }
+
+    // get pathname of request
+    var path = getPathname(req);
+
+    if (path == null) {
+      return done(layerError);
+    }
+
+    // find next matching layer
+    var layer;
+    var match;
+    var route;
+
+    while (match !== true && idx < stack.length) {
+      layer = stack[idx++];
+      match = matchLayer(layer, path);
+      route = layer.route;
+
+      if (typeof match !== 'boolean') {
+        // hold on to layerError
+        layerError = layerError || match;
+      }
+
+      if (match !== true) {
+        continue;
+      }
+
+      if (!route) {
+        // process non-route handlers normally
+        continue;
+      }
+
+      if (layerError) {
+        // routes do not match with a pending error
+        match = false;
+        continue;
+      }
+
+      var method = req.method;
+      var has_method = route._handles_method(method);
+
+      // build up automatic options response
+      if (!has_method && method === 'OPTIONS') {
+        appendMethods(options, route._options());
+      }
+
+      // don't even bother matching route
+      if (!has_method && method !== 'HEAD') {
+        match = false;
+        continue;
+      }
+    }
+
+    // no match
+    if (match !== true) {
+      return done(layerError);
+    }
+
+    // store route for dispatch on change
+    if (route) {
+      req.route = route;
+    }
+
+    // Capture one-time layer values
+    req.params = self.mergeParams
+      ? mergeParams(layer.params, parentParams)
+      : layer.params;
+    var layerPath = layer.path;
+
+    // this should be done for the layer
+    self.process_params(layer, paramcalled, req, res, function (err) {
+      if (err) {
+        return next(layerError || err);
+      }
+
+      if (route) {
+        return layer.handle_request(req, res, next);
+      }
+
+      trim_prefix(layer, layerError, layerPath, path);
+    });
+  }
+
+  function trim_prefix(layer, layerError, layerPath, path) {
+    var c = path[layerPath.length];
+    if (c && '/' !== c && '.' !== c) return next(layerError);
+
+     // Trim off the part of the url that matches the route
+     // middleware (.use stuff) needs to have the path stripped
+    if (layerPath.length !== 0) {
+      debug('trim prefix (%s) from url %s', layerPath, req.url);
+      removed = layerPath;
+      req.url = protohost + req.url.substr(protohost.length + removed.length);
+
+      // Ensure leading slash
+      if (!fqdn && req.url[0] !== '/') {
+        req.url = '/' + req.url;
+        slashAdded = true;
+      }
+
+      // Setup base URL (no trailing slash)
+      req.baseUrl = parentUrl + (removed[removed.length - 1] === '/'
+        ? removed.substring(0, removed.length - 1)
+        : removed);
+    }
+
+    debug('%s %s : %s', layer.name, layerPath, req.originalUrl);
+
+    if (layerError) {
+      layer.handle_error(layerError, req, res, next);
+    } else {
+      layer.handle_request(req, res, next);
+    }
+  }
+};
+
+/**
+ * Process any parameters for the layer.
+ * @private
+ */
+
+proto.process_params = function process_params(layer, called, req, res, done) {
+  var params = this.params;
+
+  // captured parameters from the layer, keys and values
+  var keys = layer.keys;
+
+  // fast track
+  if (!keys || keys.length === 0) {
+    return done();
+  }
+
+  var i = 0;
+  var name;
+  var paramIndex = 0;
+  var key;
+  var paramVal;
+  var paramCallbacks;
+  var paramCalled;
+
+  // process params in order
+  // param callbacks can be async
+  function param(err) {
+    if (err) {
+      return done(err);
+    }
+
+    if (i >= keys.length ) {
+      return done();
+    }
+
+    paramIndex = 0;
+    key = keys[i++];
+
+    if (!key) {
+      return done();
+    }
+
+    name = key.name;
+    paramVal = req.params[name];
+    paramCallbacks = params[name];
+    paramCalled = called[name];
+
+    if (paramVal === undefined || !paramCallbacks) {
+      return param();
+    }
+
+    // param previously called with same value or error occurred
+    if (paramCalled && (paramCalled.match === paramVal
+      || (paramCalled.error && paramCalled.error !== 'route'))) {
+      // restore value
+      req.params[name] = paramCalled.value;
+
+      // next param
+      return param(paramCalled.error);
+    }
+
+    called[name] = paramCalled = {
+      error: null,
+      match: paramVal,
+      value: paramVal
+    };
+
+    paramCallback();
+  }
+
+  // single param callbacks
+  function paramCallback(err) {
+    var fn = paramCallbacks[paramIndex++];
+
+    // store updated value
+    paramCalled.value = req.params[key.name];
+
+    if (err) {
+      // store error
+      paramCalled.error = err;
+      param(err);
+      return;
+    }
+
+    if (!fn) return param();
+
+    try {
+      fn(req, res, paramCallback, paramVal, key.name);
+    } catch (e) {
+      paramCallback(e);
+    }
+  }
+
+  param();
+};
+
+/**
+ * Use the given middleware function, with optional path, defaulting to "/".
+ *
+ * Use (like `.all`) will run for any http METHOD, but it will not add
+ * handlers for those methods so OPTIONS requests will not consider `.use`
+ * functions even if they could respond.
+ *
+ * The other difference is that _route_ path is stripped and not visible
+ * to the handler function. The main effect of this feature is that mounted
+ * handlers can operate without any code changes regardless of the "prefix"
+ * pathname.
+ *
+ * @public
+ */
+
+proto.use = function use(fn) {
+  var offset = 0;
+  var path = '/';
+
+  // default path to '/'
+  // disambiguate router.use([fn])
+  if (typeof fn !== 'function') {
+    var arg = fn;
+
+    while (Array.isArray(arg) && arg.length !== 0) {
+      arg = arg[0];
+    }
+
+    // first arg is the path
+    if (typeof arg !== 'function') {
+      offset = 1;
+      path = fn;
+    }
+  }
+
+  var callbacks = flatten(slice.call(arguments, offset));
+
+  if (callbacks.length === 0) {
+    throw new TypeError('Router.use() requires middleware functions');
+  }
+
+  for (var i = 0; i < callbacks.length; i++) {
+    var fn = callbacks[i];
+
+    if (typeof fn !== 'function') {
+      throw new TypeError('Router.use() requires middleware function but got a ' + gettype(fn));
+    }
+
+    // add the middleware
+    debug('use %s %s', path, fn.name || '<anonymous>');
+
+    var layer = new Layer(path, {
+      sensitive: this.caseSensitive,
+      strict: false,
+      end: false
+    }, fn);
+
+    layer.route = undefined;
+
+    this.stack.push(layer);
+  }
+
+  return this;
+};
+
+/**
+ * Create a new Route for the given path.
+ *
+ * Each route contains a separate middleware stack and VERB handlers.
+ *
+ * See the Route api documentation for details on adding handlers
+ * and middleware to routes.
+ *
+ * @param {String} path
+ * @return {Route}
+ * @public
+ */
+
+proto.route = function route(path) {
+  var route = new Route(path);
+
+  var layer = new Layer(path, {
+    sensitive: this.caseSensitive,
+    strict: this.strict,
+    end: true
+  }, route.dispatch.bind(route));
+
+  layer.route = route;
+
+  this.stack.push(layer);
+  return route;
+};
+
+// create Router#VERB functions
+methods.concat('all').forEach(function(method){
+  proto[method] = function(path){
+    var route = this.route(path)
+    route[method].apply(route, slice.call(arguments, 1));
+    return this;
+  };
+});
+
+// append methods to a list of methods
+function appendMethods(list, addition) {
+  for (var i = 0; i < addition.length; i++) {
+    var method = addition[i];
+    if (list.indexOf(method) === -1) {
+      list.push(method);
+    }
+  }
+}
+
+// get pathname of request
+function getPathname(req) {
+  try {
+    return parseUrl(req).pathname;
+  } catch (err) {
+    return undefined;
+  }
+}
+
+// get type for error message
+function gettype(obj) {
+  var type = typeof obj;
+
+  if (type !== 'object') {
+    return type;
+  }
+
+  // inspect [[Class]] for objects
+  return toString.call(obj)
+    .replace(objectRegExp, '$1');
+}
+
+/**
+ * Match path to a layer.
+ *
+ * @param {Layer} layer
+ * @param {string} path
+ * @private
+ */
+
+function matchLayer(layer, path) {
+  try {
+    return layer.match(path);
+  } catch (err) {
+    return err;
+  }
+}
+
+// merge params with parent params
+function mergeParams(params, parent) {
+  if (typeof parent !== 'object' || !parent) {
+    return params;
+  }
+
+  // make copy of parent for base
+  var obj = mixin({}, parent);
+
+  // simple non-numeric merging
+  if (!(0 in params) || !(0 in parent)) {
+    return mixin(obj, params);
+  }
+
+  var i = 0;
+  var o = 0;
+
+  // determine numeric gaps
+  while (i in params) {
+    i++;
+  }
+
+  while (o in parent) {
+    o++;
+  }
+
+  // offset numeric indices in params before merge
+  for (i--; i >= 0; i--) {
+    params[i + o] = params[i];
+
+    // create holes for the merge when necessary
+    if (i < o) {
+      delete params[i];
+    }
+  }
+
+  return mixin(obj, params);
+}
+
+// restore obj props after function
+function restore(fn, obj) {
+  var props = new Array(arguments.length - 2);
+  var vals = new Array(arguments.length - 2);
+
+  for (var i = 0; i < props.length; i++) {
+    props[i] = arguments[i + 2];
+    vals[i] = obj[props[i]];
+  }
+
+  return function(err){
+    // restore vals
+    for (var i = 0; i < props.length; i++) {
+      obj[props[i]] = vals[i];
+    }
+
+    return fn.apply(this, arguments);
+  };
+}
+
+// send an OPTIONS response
+function sendOptionsResponse(res, options, next) {
+  try {
+    var body = options.join(',');
+    res.set('Allow', body);
+    res.send(body);
+  } catch (err) {
+    next(err);
+  }
+}
+
+// wrap a function
+function wrap(old, fn) {
+  return function proxy() {
+    var args = new Array(arguments.length + 1);
+
+    args[0] = old;
+    for (var i = 0, len = arguments.length; i < len; i++) {
+      args[i + 1] = arguments[i];
+    }
+
+    fn.apply(this, args);
+  };
+}
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/layer.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/layer.js
new file mode 100644
index 0000000..fe9210c
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/layer.js
@@ -0,0 +1,176 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var pathRegexp = require('path-to-regexp');
+var debug = require('debug')('express:router:layer');
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = Layer;
+
+function Layer(path, options, fn) {
+  if (!(this instanceof Layer)) {
+    return new Layer(path, options, fn);
+  }
+
+  debug('new %s', path);
+  var opts = options || {};
+
+  this.handle = fn;
+  this.name = fn.name || '<anonymous>';
+  this.params = undefined;
+  this.path = undefined;
+  this.regexp = pathRegexp(path, this.keys = [], opts);
+
+  if (path === '/' && opts.end === false) {
+    this.regexp.fast_slash = true;
+  }
+}
+
+/**
+ * Handle the error for the layer.
+ *
+ * @param {Error} error
+ * @param {Request} req
+ * @param {Response} res
+ * @param {function} next
+ * @api private
+ */
+
+Layer.prototype.handle_error = function handle_error(error, req, res, next) {
+  var fn = this.handle;
+
+  if (fn.length !== 4) {
+    // not a standard error handler
+    return next(error);
+  }
+
+  try {
+    fn(error, req, res, next);
+  } catch (err) {
+    next(err);
+  }
+};
+
+/**
+ * Handle the request for the layer.
+ *
+ * @param {Request} req
+ * @param {Response} res
+ * @param {function} next
+ * @api private
+ */
+
+Layer.prototype.handle_request = function handle(req, res, next) {
+  var fn = this.handle;
+
+  if (fn.length > 3) {
+    // not a standard request handler
+    return next();
+  }
+
+  try {
+    fn(req, res, next);
+  } catch (err) {
+    next(err);
+  }
+};
+
+/**
+ * Check if this route matches `path`, if so
+ * populate `.params`.
+ *
+ * @param {String} path
+ * @return {Boolean}
+ * @api private
+ */
+
+Layer.prototype.match = function match(path) {
+  if (path == null) {
+    // no path, nothing matches
+    this.params = undefined;
+    this.path = undefined;
+    return false;
+  }
+
+  if (this.regexp.fast_slash) {
+    // fast path non-ending match for / (everything matches)
+    this.params = {};
+    this.path = '';
+    return true;
+  }
+
+  var m = this.regexp.exec(path);
+
+  if (!m) {
+    this.params = undefined;
+    this.path = undefined;
+    return false;
+  }
+
+  // store values
+  this.params = {};
+  this.path = m[0];
+
+  var keys = this.keys;
+  var params = this.params;
+
+  for (var i = 1; i < m.length; i++) {
+    var key = keys[i - 1];
+    var prop = key.name;
+    var val = decode_param(m[i]);
+
+    if (val !== undefined || !(hasOwnProperty.call(params, prop))) {
+      params[prop] = val;
+    }
+  }
+
+  return true;
+};
+
+/**
+ * Decode param value.
+ *
+ * @param {string} val
+ * @return {string}
+ * @private
+ */
+
+function decode_param(val) {
+  if (typeof val !== 'string' || val.length === 0) {
+    return val;
+  }
+
+  try {
+    return decodeURIComponent(val);
+  } catch (err) {
+    if (err instanceof URIError) {
+      err.message = 'Failed to decode param \'' + val + '\'';
+      err.status = err.statusCode = 400;
+    }
+
+    throw err;
+  }
+}
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/route.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/route.js
new file mode 100644
index 0000000..2788d7b
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/router/route.js
@@ -0,0 +1,210 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var debug = require('debug')('express:router:route');
+var flatten = require('array-flatten');
+var Layer = require('./layer');
+var methods = require('methods');
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var slice = Array.prototype.slice;
+var toString = Object.prototype.toString;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = Route;
+
+/**
+ * Initialize `Route` with the given `path`,
+ *
+ * @param {String} path
+ * @public
+ */
+
+function Route(path) {
+  this.path = path;
+  this.stack = [];
+
+  debug('new %s', path);
+
+  // route handlers for various http methods
+  this.methods = {};
+}
+
+/**
+ * Determine if the route handles a given method.
+ * @private
+ */
+
+Route.prototype._handles_method = function _handles_method(method) {
+  if (this.methods._all) {
+    return true;
+  }
+
+  var name = method.toLowerCase();
+
+  if (name === 'head' && !this.methods['head']) {
+    name = 'get';
+  }
+
+  return Boolean(this.methods[name]);
+};
+
+/**
+ * @return {Array} supported HTTP methods
+ * @private
+ */
+
+Route.prototype._options = function _options() {
+  var methods = Object.keys(this.methods);
+
+  // append automatic head
+  if (this.methods.get && !this.methods.head) {
+    methods.push('head');
+  }
+
+  for (var i = 0; i < methods.length; i++) {
+    // make upper case
+    methods[i] = methods[i].toUpperCase();
+  }
+
+  return methods;
+};
+
+/**
+ * dispatch req, res into this route
+ * @private
+ */
+
+Route.prototype.dispatch = function dispatch(req, res, done) {
+  var idx = 0;
+  var stack = this.stack;
+  if (stack.length === 0) {
+    return done();
+  }
+
+  var method = req.method.toLowerCase();
+  if (method === 'head' && !this.methods['head']) {
+    method = 'get';
+  }
+
+  req.route = this;
+
+  next();
+
+  function next(err) {
+    if (err && err === 'route') {
+      return done();
+    }
+
+    var layer = stack[idx++];
+    if (!layer) {
+      return done(err);
+    }
+
+    if (layer.method && layer.method !== method) {
+      return next(err);
+    }
+
+    if (err) {
+      layer.handle_error(err, req, res, next);
+    } else {
+      layer.handle_request(req, res, next);
+    }
+  }
+};
+
+/**
+ * Add a handler for all HTTP verbs to this route.
+ *
+ * Behaves just like middleware and can respond or call `next`
+ * to continue processing.
+ *
+ * You can use multiple `.all` call to add multiple handlers.
+ *
+ *   function check_something(req, res, next){
+ *     next();
+ *   };
+ *
+ *   function validate_user(req, res, next){
+ *     next();
+ *   };
+ *
+ *   route
+ *   .all(validate_user)
+ *   .all(check_something)
+ *   .get(function(req, res, next){
+ *     res.send('hello world');
+ *   });
+ *
+ * @param {function} handler
+ * @return {Route} for chaining
+ * @api public
+ */
+
+Route.prototype.all = function all() {
+  var handles = flatten(slice.call(arguments));
+
+  for (var i = 0; i < handles.length; i++) {
+    var handle = handles[i];
+
+    if (typeof handle !== 'function') {
+      var type = toString.call(handle);
+      var msg = 'Route.all() requires callback functions but got a ' + type;
+      throw new TypeError(msg);
+    }
+
+    var layer = Layer('/', {}, handle);
+    layer.method = undefined;
+
+    this.methods._all = true;
+    this.stack.push(layer);
+  }
+
+  return this;
+};
+
+methods.forEach(function(method){
+  Route.prototype[method] = function(){
+    var handles = flatten(slice.call(arguments));
+
+    for (var i = 0; i < handles.length; i++) {
+      var handle = handles[i];
+
+      if (typeof handle !== 'function') {
+        var type = toString.call(handle);
+        var msg = 'Route.' + method + '() requires callback functions but got a ' + type;
+        throw new Error(msg);
+      }
+
+      debug('%s %s', method, this.path);
+
+      var layer = Layer('/', {}, handle);
+      layer.method = method;
+
+      this.methods[method] = true;
+      this.stack.push(layer);
+    }
+
+    return this;
+  };
+});
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/utils.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/utils.js
new file mode 100644
index 0000000..f418c58
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/utils.js
@@ -0,0 +1,299 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @api private
+ */
+
+var contentDisposition = require('content-disposition');
+var contentType = require('content-type');
+var deprecate = require('depd')('express');
+var flatten = require('array-flatten');
+var mime = require('send').mime;
+var basename = require('path').basename;
+var etag = require('etag');
+var proxyaddr = require('proxy-addr');
+var qs = require('qs');
+var querystring = require('querystring');
+
+/**
+ * Return strong ETag for `body`.
+ *
+ * @param {String|Buffer} body
+ * @param {String} [encoding]
+ * @return {String}
+ * @api private
+ */
+
+exports.etag = function (body, encoding) {
+  var buf = !Buffer.isBuffer(body)
+    ? new Buffer(body, encoding)
+    : body;
+
+  return etag(buf, {weak: false});
+};
+
+/**
+ * Return weak ETag for `body`.
+ *
+ * @param {String|Buffer} body
+ * @param {String} [encoding]
+ * @return {String}
+ * @api private
+ */
+
+exports.wetag = function wetag(body, encoding){
+  var buf = !Buffer.isBuffer(body)
+    ? new Buffer(body, encoding)
+    : body;
+
+  return etag(buf, {weak: true});
+};
+
+/**
+ * Check if `path` looks absolute.
+ *
+ * @param {String} path
+ * @return {Boolean}
+ * @api private
+ */
+
+exports.isAbsolute = function(path){
+  if ('/' === path[0]) return true;
+  if (':' === path[1] && ('\\' === path[2] || '/' === path[2])) return true; // Windows device path
+  if ('\\\\' === path.substring(0, 2)) return true; // Microsoft Azure absolute path
+};
+
+/**
+ * Flatten the given `arr`.
+ *
+ * @param {Array} arr
+ * @return {Array}
+ * @api private
+ */
+
+exports.flatten = deprecate.function(flatten,
+  'utils.flatten: use array-flatten npm module instead');
+
+/**
+ * Normalize the given `type`, for example "html" becomes "text/html".
+ *
+ * @param {String} type
+ * @return {Object}
+ * @api private
+ */
+
+exports.normalizeType = function(type){
+  return ~type.indexOf('/')
+    ? acceptParams(type)
+    : { value: mime.lookup(type), params: {} };
+};
+
+/**
+ * Normalize `types`, for example "html" becomes "text/html".
+ *
+ * @param {Array} types
+ * @return {Array}
+ * @api private
+ */
+
+exports.normalizeTypes = function(types){
+  var ret = [];
+
+  for (var i = 0; i < types.length; ++i) {
+    ret.push(exports.normalizeType(types[i]));
+  }
+
+  return ret;
+};
+
+/**
+ * Generate Content-Disposition header appropriate for the filename.
+ * non-ascii filenames are urlencoded and a filename* parameter is added
+ *
+ * @param {String} filename
+ * @return {String}
+ * @api private
+ */
+
+exports.contentDisposition = deprecate.function(contentDisposition,
+  'utils.contentDisposition: use content-disposition npm module instead');
+
+/**
+ * Parse accept params `str` returning an
+ * object with `.value`, `.quality` and `.params`.
+ * also includes `.originalIndex` for stable sorting
+ *
+ * @param {String} str
+ * @return {Object}
+ * @api private
+ */
+
+function acceptParams(str, index) {
+  var parts = str.split(/ *; */);
+  var ret = { value: parts[0], quality: 1, params: {}, originalIndex: index };
+
+  for (var i = 1; i < parts.length; ++i) {
+    var pms = parts[i].split(/ *= */);
+    if ('q' === pms[0]) {
+      ret.quality = parseFloat(pms[1]);
+    } else {
+      ret.params[pms[0]] = pms[1];
+    }
+  }
+
+  return ret;
+}
+
+/**
+ * Compile "etag" value to function.
+ *
+ * @param  {Boolean|String|Function} val
+ * @return {Function}
+ * @api private
+ */
+
+exports.compileETag = function(val) {
+  var fn;
+
+  if (typeof val === 'function') {
+    return val;
+  }
+
+  switch (val) {
+    case true:
+      fn = exports.wetag;
+      break;
+    case false:
+      break;
+    case 'strong':
+      fn = exports.etag;
+      break;
+    case 'weak':
+      fn = exports.wetag;
+      break;
+    default:
+      throw new TypeError('unknown value for etag function: ' + val);
+  }
+
+  return fn;
+}
+
+/**
+ * Compile "query parser" value to function.
+ *
+ * @param  {String|Function} val
+ * @return {Function}
+ * @api private
+ */
+
+exports.compileQueryParser = function compileQueryParser(val) {
+  var fn;
+
+  if (typeof val === 'function') {
+    return val;
+  }
+
+  switch (val) {
+    case true:
+      fn = querystring.parse;
+      break;
+    case false:
+      fn = newObject;
+      break;
+    case 'extended':
+      fn = parseExtendedQueryString;
+      break;
+    case 'simple':
+      fn = querystring.parse;
+      break;
+    default:
+      throw new TypeError('unknown value for query parser function: ' + val);
+  }
+
+  return fn;
+}
+
+/**
+ * Compile "proxy trust" value to function.
+ *
+ * @param  {Boolean|String|Number|Array|Function} val
+ * @return {Function}
+ * @api private
+ */
+
+exports.compileTrust = function(val) {
+  if (typeof val === 'function') return val;
+
+  if (val === true) {
+    // Support plain true/false
+    return function(){ return true };
+  }
+
+  if (typeof val === 'number') {
+    // Support trusting hop count
+    return function(a, i){ return i < val };
+  }
+
+  if (typeof val === 'string') {
+    // Support comma-separated values
+    val = val.split(/ *, */);
+  }
+
+  return proxyaddr.compile(val || []);
+}
+
+/**
+ * Set the charset in a given Content-Type string.
+ *
+ * @param {String} type
+ * @param {String} charset
+ * @return {String}
+ * @api private
+ */
+
+exports.setCharset = function setCharset(type, charset) {
+  if (!type || !charset) {
+    return type;
+  }
+
+  // parse type
+  var parsed = contentType.parse(type);
+
+  // set charset
+  parsed.parameters.charset = charset;
+
+  // format type
+  return contentType.format(parsed);
+};
+
+/**
+ * Parse an extended query string with qs.
+ *
+ * @return {Object}
+ * @private
+ */
+
+function parseExtendedQueryString(str) {
+  return qs.parse(str, {
+    allowPrototypes: true
+  });
+}
+
+/**
+ * Return new empty object.
+ *
+ * @return {Object}
+ * @api private
+ */
+
+function newObject() {
+  return {};
+}
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/view.js b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/view.js
new file mode 100644
index 0000000..52415d4
--- /dev/null
+++ b/common/src/main/webapp/usageguide/appserver/node_modules/express/lib/view.js
@@ -0,0 +1,173 @@
+/*!
+ * express
+ * Copyright(c) 2009-2013 TJ Holowaychuk
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var debug = require('debug')('express:view');
+var path = require('path');
+var fs = require('fs');
+var utils = require('./utils');
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var dirname = path.dirname;
+var basename = path.basename;
+var extname = path.extname;
+var join = path.join;
+var resolve = path.resolve;
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = View;
+
+/**
+ * Initialize a new `View` with the given `name`.
+ *
+ * Options:
+ *
+ *   - `defaultEngine` the default template engine name
+ *   - `engines` template engine require() cache
+ *   - `root` root path for view lookup
+ *
+ * @param {string} name
+ * @param {object} options
+ * @public
+ */
+
+function View(name, options) {
+  var opts = options || {};
+
+  this.defaultEngine = opts.defaultEngine;
+  this.ext = extname(name);
+  this.name = name;
+  this.root = opts.root;
+
+  if (!this.ext && !this.defaultEngine) {
+    throw new Error('No default engine was specified and no extension was provided.');
+  }
+
+  var fileName = name;
+
+  if (!this.ext) {
+    // get extension from default engine name
+    this.ext = this.defaultEngine[0] !== '.'
+      ? '.' + this.defaultEngine
+      : this.defaultEngine;
+
+    fileName += this.ext;
+  }
+
+  if (!opts.engines[this.ext]) {
+    // load engine
+    opts.engines[this.ext] = require(this.ext.substr(1)).__express;
+  }
+
+  // store loaded engine
+  this.engine = opts.engines[this.ext];
+
+  // lookup path
+  this.path = this.lookup(fileName);
+}
+
+/**
+ * Lookup view by the given `name`
+ *
+ * @param {string} name
+ * @private
+ */
+
+View.prototype.lookup = function lookup(name) {
+  var path;
+  var roots = [].concat(this.root);
+
+  debug('lookup "%s"', name);
+
+  for (var i = 0; i < roots.length && !path; i++) {
+    var root = roots[i];
+
+    // resolve the path
+    var loc = resolve(root, name);
+    var dir = dirname(loc);
+    var file = basename(loc);
+
+    // resolve the file
+    path = this.resolve(dir, file);
+  }
+
+  return path;
+};
+
+/**
+ * Render with the given options.
+ *
+ * @param {object} options
+ * @param {function} callback
+ * @private
+ */
+
+View.prototype.render = function render(options, callback) {
+  debug('render "%s"', this.path);
+  this.engine(this.path, options, callback);
+};
+
+/**
+ * Resolve the file within the given directory.
+ *
+ * @param {string} dir
+ * @param {string} file
+ * @private
+ */
+
+View.prototype.resolve = function resolve(dir, file) {
+  var ext = this.ext;
+
+  // <path>.<ext>
+  var path = join(dir, file);
+  var stat = tryStat(path);
+
+  if (stat && stat.isFile()) {
+    return path;
+  }
+
+  // <path>/index.<ext>
+  path = join(dir, basename(file, ext), 'index' + ext);
+  stat = tryStat(path);
+
+  if (stat && stat.isFile()) {
+    return path;
+  }
+};
+
+/**
+ * Return a stat, maybe.
+ *
+ * @param {string} path
+ * @return {fs.Stats}
+ * @private
+ */
+
+function tryStat(path) {
+  debug('stat "%s"', path);
+
+  try {
+    return fs.statSync(path);
+  } catch (e) {
+    return undefined;
+  }
+}