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-# compression
-
-[![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]
-
-Node.js compression middleware.
-
-The following compression codings are supported:
-
-  - deflate
-  - gzip
-
-## Install
-
-```bash
-$ npm install compression
-```
-
-## API
-
-```js
-var compression = require('compression')
-```
-
-### compression([options])
-
-Returns the compression middleware using the given `options`. The middleware
-will attempt to compress response bodies for all request that traverse through
-the middleware, based on the given `options`.
-
-This middleware will never compress responses that include a `Cache-Control`
-header with the [`no-transform` directive](https://tools.ietf.org/html/rfc7234#section-5.2.2.4),
-as compressing will transform the body.
-
-#### Options
-
-`compression()` accepts these properties in the options object. In addition to
-those listed below, [zlib](http://nodejs.org/api/zlib.html) options may be
-passed in to the options object.
-
-##### chunkSize
-
-The default value is `zlib.Z_DEFAULT_CHUNK`, or `16384`.
-
-See [Node.js documentation](http://nodejs.org/api/zlib.html#zlib_memory_usage_tuning)
-regarding the usage.
-
-##### filter
-
-A function to decide if the response should be considered for compression.
-This function is called as `filter(req, res)` and is expected to return
-`true` to consider the response for compression, or `false` to not compress
-the response.
-
-The default filter function uses the [compressible](https://www.npmjs.com/package/compressible)
-module to determine if `res.getHeader('Content-Type')` is compressible.
-
-##### level
-
-The level of zlib compression to apply to responses. A higher level will result
-in better compression, but will take longer to complete. A lower level will
-result in less compression, but will be much faster.
-
-This is an integer in the range of `0` (no compression) to `9` (maximum
-compression). The special value `-1` can be used to mean the "default
-compression level", which is a default compromise between speed and
-compression (currently equivalent to level 6).
-
-  - `-1` Default compression level (also `zlib.Z_DEFAULT_COMPRESSION`).
-  - `0` No compression (also `zlib.Z_NO_COMPRESSION`).
-  - `1` Fastest compression (also `zlib.Z_BEST_SPEED`).
-  - `2`
-  - `3`
-  - `4`
-  - `5`
-  - `6` (currently what `zlib.Z_DEFAULT_COMPRESSION` points to).
-  - `7`
-  - `8`
-  - `9` Best compression (also `zlib.Z_BEST_COMPRESSION`).
-
-The default value is `zlib.Z_DEFAULT_COMPRESSION`, or `-1`.
-
-**Note** in the list above, `zlib` is from `zlib = require('zlib')`.
-
-##### memLevel
-
-This specifies how much memory should be allocated for the internal compression
-state and is an integer in the range of `1` (minimum level) and `9` (maximum
-level).
-
-The default value is `zlib.Z_DEFAULT_MEMLEVEL`, or `8`.
-
-See [Node.js documentation](http://nodejs.org/api/zlib.html#zlib_memory_usage_tuning)
-regarding the usage.
-
-##### strategy
-
-This is used to tune the compression algorithm. This value only affects the
-compression ratio, not the correctness of the compressed output, even if it
-is not set appropriately.
-
-  - `zlib.Z_DEFAULT_STRATEGY` Use for normal data.
-  - `zlib.Z_FILTERED` Use for data produced by a filter (or predictor).
-    Filtered data consists mostly of small values with a somewhat random
-    distribution. In this case, the compression algorithm is tuned to
-    compress them better. The effect is to force more Huffman coding and less
-    string matching; it is somewhat intermediate between `zlib.Z_DEFAULT_STRATEGY`
-    and `zlib.Z_HUFFMAN_ONLY`.
-  - `zlib.Z_FIXED` Use to prevent the use of dynamic Huffman codes, allowing
-    for a simpler decoder for special applications.
-  - `zlib.Z_HUFFMAN_ONLY` Use to force Huffman encoding only (no string match).
-  - `zlib.Z_RLE` Use to limit match distances to one (run-length encoding).
-    This is designed to be almost as fast as `zlib.Z_HUFFMAN_ONLY`, but give
-    better compression for PNG image data.
-
-**Note** in the list above, `zlib` is from `zlib = require('zlib')`.
-
-##### threshold
-
-The byte threshold for the response body size before compression is considered
-for the response, defaults to `1kb`. This is a number of bytes, any string
-accepted by the [bytes](https://www.npmjs.com/package/bytes) module, or `false`.
-
-**Note** this is only an advisory setting; if the response size cannot be determined
-at the time the response headers are written, then it is assumed the response is
-_over_ the threshold. To guarantee the response size can be determined, be sure
-set a `Content-Length` response header.
-
-##### windowBits
-
-The default value is `zlib.Z_DEFAULT_WINDOWBITS`, or `15`.
-
-See [Node.js documentation](http://nodejs.org/api/zlib.html#zlib_memory_usage_tuning)
-regarding the usage.
-
-#### .filter
-
-The default `filter` function. This is used to construct a custom filter
-function that is an extension of the default function.
-
-```js
-app.use(compression({filter: shouldCompress}))
-
-function shouldCompress(req, res) {
-  if (req.headers['x-no-compression']) {
-    // don't compress responses with this request header
-    return false
-  }
-
-  // fallback to standard filter function
-  return compression.filter(req, res)
-}
-```
-
-### res.flush
-
-This module adds a `res.flush()` method to force the partially-compressed
-response to be flushed to the client.
-
-## Examples
-
-### express/connect
-
-When using this module with express or connect, simply `app.use` the module as
-high as you like. Requests that pass through the middleware will be compressed.
-
-```js
-var compression = require('compression')
-var express = require('express')
-
-var app = express()
-
-// compress all requests
-app.use(compression())
-
-// add all routes
-```
-
-### Server-Sent Events
-
-Because of the nature of compression this module does not work out of the box
-with server-sent events. To compress content, a window of the output needs to
-be buffered up in order to get good compression. Typically when using server-sent
-events, there are certain block of data that need to reach the client.
-
-You can achieve this by calling `res.flush()` when you need the data written to
-actually make it to the client.
-
-```js
-var compression = require('compression')
-var express     = require('express')
-
-var app = express()
-
-// compress responses
-app.use(compression())
-
-// server-sent event stream
-app.get('/events', function (req, res) {
-  res.setHeader('Content-Type', 'text/event-stream')
-  res.setHeader('Cache-Control', 'no-cache')
-
-  // send a ping approx every 2 seconds
-  var timer = setInterval(function () {
-    res.write('data: ping\n\n')
-
-    // !!! this is the important part
-    res.flush()
-  }, 2000)
-
-  res.on('close', function () {
-    clearInterval(timer)
-  })
-})
-```
-
-## License
-
-[MIT](LICENSE)
-
-[npm-image]: https://img.shields.io/npm/v/compression.svg
-[npm-url]: https://npmjs.org/package/compression
-[travis-image]: https://img.shields.io/travis/expressjs/compression/master.svg
-[travis-url]: https://travis-ci.org/expressjs/compression
-[coveralls-image]: https://img.shields.io/coveralls/expressjs/compression/master.svg
-[coveralls-url]: https://coveralls.io/r/expressjs/compression?branch=master
-[downloads-image]: https://img.shields.io/npm/dm/compression.svg
-[downloads-url]: https://npmjs.org/package/compression
-[gratipay-image]: https://img.shields.io/gratipay/dougwilson.svg
-[gratipay-url]: https://www.gratipay.com/dougwilson/