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+# response-time
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Build Status][travis-image]][travis-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+[![Gratipay][gratipay-image]][gratipay-url]
+
+Response time for Node.js servers.
+
+This module creates a middleware that records the response time for
+requests in HTTP servers. The "response time" is defined here as the
+elapsed time from when a request enters this middleware to when the
+headers are written out to the client.
+
+## Installation
+
+```sh
+$ npm install response-time
+```
+
+## API
+
+```js
+var responseTime = require('response-time')
+```
+
+### responseTime([options])
+
+Create a middleware that adds a `X-Response-Time` header to responses. If
+you don't want to use this module to automatically set a header, please
+see the section about [`responseTime(fn)`](#responsetimeoptions).
+
+#### Options
+
+The `responseTime` function accepts an optional `options` object that may
+contain any of the following keys:
+
+##### digits
+
+The fixed number of digits to include in the output, which is always in
+milliseconds, defaults to `3` (ex: `2.300ms`).
+
+##### header
+
+The name of the header to set, defaults to `X-Response-Time`.
+
+##### suffix
+
+Boolean to indicate if units of measurement suffix should be added to
+the output, defaults to `true` (ex: `2.300ms` vs `2.300`).
+
+### responseTime(fn)
+
+Create a new middleware that records the response time of a request and
+makes this available to your own function `fn`. The `fn` argument will be
+invoked as `fn(req, res, time)`, where `time` is a number in milliseconds.
+
+## Examples
+
+### express/connect
+
+```js
+var express = require('express')
+var responseTime = require('response-time')
+
+var app = express()
+
+app.use(responseTime())
+
+app.get('/', function (req, res) {
+  res.send('hello, world!')
+})
+```
+
+### vanilla http server
+
+```js
+var finalhandler = require('finalhandler')
+var http = require('http')
+var responseTime = require('response-time')
+
+// create "middleware"
+var _responseTime = responseTime()
+
+http.createServer(function (req, res) {
+  var done = finalhandler(req, res)
+  _responseTime(req, res, function (err) {
+    if (err) return done(err)
+
+    // respond to request
+    res.setHeader('content-type', 'text/plain')
+    res.end('hello, world!')
+  })
+})
+```
+
+### response time metrics
+
+```js
+var express = require('express')
+var responseTime = require('response-time')
+var StatsD = require('node-statsd')
+
+var app = express()
+var stats = new StatsD()
+
+stats.socket.on('error', function (error) {
+  console.error(error.stack)
+})
+
+app.use(responseTime(function (req, res, time) {
+  var stat = (req.method + req.url).toLowerCase()
+    .replace(/[:\.]/g, '')
+    .replace(/\//g, '_')
+  stats.timing(stat, time)
+}))
+
+app.get('/', function (req, res) {
+  res.send('hello, world!')
+})
+```
+
+## License
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/response-time.svg
+[npm-url]: https://npmjs.org/package/response-time
+[travis-image]: https://img.shields.io/travis/expressjs/response-time/master.svg
+[travis-url]: https://travis-ci.org/expressjs/response-time
+[coveralls-image]: https://img.shields.io/coveralls/expressjs/response-time/master.svg
+[coveralls-url]: https://coveralls.io/r/expressjs/response-time?branch=master
+[downloads-image]: https://img.shields.io/npm/dm/response-time.svg
+[downloads-url]: https://npmjs.org/package/response-time
+[gratipay-image]: https://img.shields.io/gratipay/dougwilson.svg
+[gratipay-url]: https://www.gratipay.com/dougwilson/