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+# etag
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][travis-image]][travis-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Create simple ETags
+
+## Installation
+
+```sh
+$ npm install etag
+```
+
+## API
+
+```js
+var etag = require('etag')
+```
+
+### etag(entity, [options])
+
+Generate a strong ETag for the given entity. This should be the complete
+body of the entity. Strings, `Buffer`s, and `fs.Stats` are accepted. By
+default, a strong ETag is generated except for `fs.Stats`, which will
+generate a weak ETag (this can be overwritten by `options.weak`).
+
+```js
+res.setHeader('ETag', etag(body))
+```
+
+#### Options
+
+`etag` accepts these properties in the options object.
+
+##### weak
+
+Specifies if the generated ETag will include the weak validator mark (that
+is, the leading `W/`). The actual entity tag is the same. The default value
+is `false`, unless the `entity` is `fs.Stats`, in which case it is `true`.
+
+## Testing
+
+```sh
+$ npm test
+```
+
+## Benchmark
+
+```bash
+$ npm run-script bench
+
+> etag@1.6.0 bench nodejs-etag
+> node benchmark/index.js
+
+  http_parser@1.0
+  node@0.10.33
+  v8@3.14.5.9
+  ares@1.9.0-DEV
+  uv@0.10.29
+  zlib@1.2.3
+  modules@11
+  openssl@1.0.1j
+
+> node benchmark/body0-100b.js
+
+  100B body
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* buffer - strong x 289,198 ops/sec ±1.09% (190 runs sampled)
+* buffer - weak   x 287,838 ops/sec ±0.91% (189 runs sampled)
+* string - strong x 284,586 ops/sec ±1.05% (192 runs sampled)
+* string - weak   x 287,439 ops/sec ±0.82% (192 runs sampled)
+
+> node benchmark/body1-1kb.js
+
+  1KB body
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* buffer - strong x 212,423 ops/sec ±0.75% (193 runs sampled)
+* buffer - weak   x 211,871 ops/sec ±0.74% (194 runs sampled)
+  string - strong x 205,291 ops/sec ±0.86% (194 runs sampled)
+  string - weak   x 208,463 ops/sec ±0.79% (192 runs sampled)
+
+> node benchmark/body2-5kb.js
+
+  5KB body
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* buffer - strong x 92,901 ops/sec ±0.58% (195 runs sampled)
+* buffer - weak   x 93,045 ops/sec ±0.65% (192 runs sampled)
+  string - strong x 89,621 ops/sec ±0.68% (194 runs sampled)
+  string - weak   x 90,070 ops/sec ±0.70% (196 runs sampled)
+
+> node benchmark/body3-10kb.js
+
+  10KB body
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* buffer - strong x 54,220 ops/sec ±0.85% (192 runs sampled)
+* buffer - weak   x 54,069 ops/sec ±0.83% (191 runs sampled)
+  string - strong x 53,078 ops/sec ±0.53% (194 runs sampled)
+  string - weak   x 53,849 ops/sec ±0.47% (197 runs sampled)
+
+> node benchmark/body4-100kb.js
+
+  100KB body
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* buffer - strong x 6,673 ops/sec ±0.15% (197 runs sampled)
+* buffer - weak   x 6,716 ops/sec ±0.12% (198 runs sampled)
+  string - strong x 6,357 ops/sec ±0.14% (197 runs sampled)
+  string - weak   x 6,344 ops/sec ±0.21% (197 runs sampled)
+
+> node benchmark/stats.js
+
+  stats
+
+  1 test completed.
+  2 tests completed.
+  3 tests completed.
+  4 tests completed.
+
+* real - strong x 1,671,989 ops/sec ±0.13% (197 runs sampled)
+* real - weak   x 1,681,297 ops/sec ±0.12% (198 runs sampled)
+  fake - strong x   927,063 ops/sec ±0.14% (198 runs sampled)
+  fake - weak   x   914,461 ops/sec ±0.41% (191 runs sampled)
+```
+
+## License
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/etag.svg
+[npm-url]: https://npmjs.org/package/etag
+[node-version-image]: https://img.shields.io/node/v/etag.svg
+[node-version-url]: http://nodejs.org/download/
+[travis-image]: https://img.shields.io/travis/jshttp/etag/master.svg
+[travis-url]: https://travis-ci.org/jshttp/etag
+[coveralls-image]: https://img.shields.io/coveralls/jshttp/etag/master.svg
+[coveralls-url]: https://coveralls.io/r/jshttp/etag?branch=master
+[downloads-image]: https://img.shields.io/npm/dm/etag.svg
+[downloads-url]: https://npmjs.org/package/etag