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-# ws: a Node.js WebSocket library
-
-[![Version npm](https://img.shields.io/npm/v/ws.svg?logo=npm)](https://www.npmjs.com/package/ws)
-[![CI](https://img.shields.io/github/workflow/status/websockets/ws/CI/master?label=CI&logo=github)](https://github.com/websockets/ws/actions?query=workflow%3ACI+branch%3Amaster)
-[![Coverage Status](https://img.shields.io/coveralls/websockets/ws/master.svg?logo=coveralls)](https://coveralls.io/github/websockets/ws)
-
-ws is a simple to use, blazing fast, and thoroughly tested WebSocket client and
-server implementation.
-
-Passes the quite extensive Autobahn test suite: [server][server-report],
-[client][client-report].
-
-**Note**: This module does not work in the browser. The client in the docs is a
-reference to a back end with the role of a client in the WebSocket
-communication. Browser clients must use the native
-[`WebSocket`](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket)
-object. To make the same code work seamlessly on Node.js and the browser, you
-can use one of the many wrappers available on npm, like
-[isomorphic-ws](https://github.com/heineiuo/isomorphic-ws).
-
-## Table of Contents
-
-- [Protocol support](#protocol-support)
-- [Installing](#installing)
-  - [Opt-in for performance](#opt-in-for-performance)
-- [API docs](#api-docs)
-- [WebSocket compression](#websocket-compression)
-- [Usage examples](#usage-examples)
-  - [Sending and receiving text data](#sending-and-receiving-text-data)
-  - [Sending binary data](#sending-binary-data)
-  - [Simple server](#simple-server)
-  - [External HTTP/S server](#external-https-server)
-  - [Multiple servers sharing a single HTTP/S server](#multiple-servers-sharing-a-single-https-server)
-  - [Client authentication](#client-authentication)
-  - [Server broadcast](#server-broadcast)
-  - [Round-trip time](#round-trip-time)
-  - [Use the Node.js streams API](#use-the-nodejs-streams-api)
-  - [Other examples](#other-examples)
-- [FAQ](#faq)
-  - [How to get the IP address of the client?](#how-to-get-the-ip-address-of-the-client)
-  - [How to detect and close broken connections?](#how-to-detect-and-close-broken-connections)
-  - [How to connect via a proxy?](#how-to-connect-via-a-proxy)
-- [Changelog](#changelog)
-- [License](#license)
-
-## Protocol support
-
-- **HyBi drafts 07-12** (Use the option `protocolVersion: 8`)
-- **HyBi drafts 13-17** (Current default, alternatively option
-  `protocolVersion: 13`)
-
-## Installing
-
-```
-npm install ws
-```
-
-### Opt-in for performance
-
-There are 2 optional modules that can be installed along side with the ws
-module. These modules are binary addons which improve certain operations.
-Prebuilt binaries are available for the most popular platforms so you don't
-necessarily need to have a C++ compiler installed on your machine.
-
-- `npm install --save-optional bufferutil`: Allows to efficiently perform
-  operations such as masking and unmasking the data payload of the WebSocket
-  frames.
-- `npm install --save-optional utf-8-validate`: Allows to efficiently check if a
-  message contains valid UTF-8.
-
-To not even try to require and use these modules, use the
-[`WS_NO_BUFFER_UTIL`](./doc/ws.md#ws_no_buffer_util) and
-[`WS_NO_UTF_8_VALIDATE`](./doc/ws.md#ws_no_utf_8_validate) environment
-variables. These might be useful to enhance security in systems where a user can
-put a package in the package search path of an application of another user, due
-to how the Node.js resolver algorithm works.
-
-## API docs
-
-See [`/doc/ws.md`](./doc/ws.md) for Node.js-like documentation of ws classes and
-utility functions.
-
-## WebSocket compression
-
-ws supports the [permessage-deflate extension][permessage-deflate] which enables
-the client and server to negotiate a compression algorithm and its parameters,
-and then selectively apply it to the data payloads of each WebSocket message.
-
-The extension is disabled by default on the server and enabled by default on the
-client. It adds a significant overhead in terms of performance and memory
-consumption so we suggest to enable it only if it is really needed.
-
-Note that Node.js has a variety of issues with high-performance compression,
-where increased concurrency, especially on Linux, can lead to [catastrophic
-memory fragmentation][node-zlib-bug] and slow performance. If you intend to use
-permessage-deflate in production, it is worthwhile to set up a test
-representative of your workload and ensure Node.js/zlib will handle it with
-acceptable performance and memory usage.
-
-Tuning of permessage-deflate can be done via the options defined below. You can
-also use `zlibDeflateOptions` and `zlibInflateOptions`, which is passed directly
-into the creation of [raw deflate/inflate streams][node-zlib-deflaterawdocs].
-
-See [the docs][ws-server-options] for more options.
-
-```js
-import WebSocket, { WebSocketServer } from 'ws';
-
-const wss = new WebSocketServer({
-  port: 8080,
-  perMessageDeflate: {
-    zlibDeflateOptions: {
-      // See zlib defaults.
-      chunkSize: 1024,
-      memLevel: 7,
-      level: 3
-    },
-    zlibInflateOptions: {
-      chunkSize: 10 * 1024
-    },
-    // Other options settable:
-    clientNoContextTakeover: true, // Defaults to negotiated value.
-    serverNoContextTakeover: true, // Defaults to negotiated value.
-    serverMaxWindowBits: 10, // Defaults to negotiated value.
-    // Below options specified as default values.
-    concurrencyLimit: 10, // Limits zlib concurrency for perf.
-    threshold: 1024 // Size (in bytes) below which messages
-    // should not be compressed if context takeover is disabled.
-  }
-});
-```
-
-The client will only use the extension if it is supported and enabled on the
-server. To always disable the extension on the client set the
-`perMessageDeflate` option to `false`.
-
-```js
-import WebSocket from 'ws';
-
-const ws = new WebSocket('ws://www.host.com/path', {
-  perMessageDeflate: false
-});
-```
-
-## Usage examples
-
-### Sending and receiving text data
-
-```js
-import WebSocket from 'ws';
-
-const ws = new WebSocket('ws://www.host.com/path');
-
-ws.on('open', function open() {
-  ws.send('something');
-});
-
-ws.on('message', function message(data) {
-  console.log('received: %s', data);
-});
-```
-
-### Sending binary data
-
-```js
-import WebSocket from 'ws';
-
-const ws = new WebSocket('ws://www.host.com/path');
-
-ws.on('open', function open() {
-  const array = new Float32Array(5);
-
-  for (var i = 0; i < array.length; ++i) {
-    array[i] = i / 2;
-  }
-
-  ws.send(array);
-});
-```
-
-### Simple server
-
-```js
-import { WebSocketServer } from 'ws';
-
-const wss = new WebSocketServer({ port: 8080 });
-
-wss.on('connection', function connection(ws) {
-  ws.on('message', function message(data) {
-    console.log('received: %s', data);
-  });
-
-  ws.send('something');
-});
-```
-
-### External HTTP/S server
-
-```js
-import { createServer } from 'https';
-import { readFileSync } from 'fs';
-import { WebSocketServer } from 'ws';
-
-const server = createServer({
-  cert: readFileSync('/path/to/cert.pem'),
-  key: readFileSync('/path/to/key.pem')
-});
-const wss = new WebSocketServer({ server });
-
-wss.on('connection', function connection(ws) {
-  ws.on('message', function message(data) {
-    console.log('received: %s', data);
-  });
-
-  ws.send('something');
-});
-
-server.listen(8080);
-```
-
-### Multiple servers sharing a single HTTP/S server
-
-```js
-import { createServer } from 'http';
-import { parse } from 'url';
-import { WebSocketServer } from 'ws';
-
-const server = createServer();
-const wss1 = new WebSocketServer({ noServer: true });
-const wss2 = new WebSocketServer({ noServer: true });
-
-wss1.on('connection', function connection(ws) {
-  // ...
-});
-
-wss2.on('connection', function connection(ws) {
-  // ...
-});
-
-server.on('upgrade', function upgrade(request, socket, head) {
-  const { pathname } = parse(request.url);
-
-  if (pathname === '/foo') {
-    wss1.handleUpgrade(request, socket, head, function done(ws) {
-      wss1.emit('connection', ws, request);
-    });
-  } else if (pathname === '/bar') {
-    wss2.handleUpgrade(request, socket, head, function done(ws) {
-      wss2.emit('connection', ws, request);
-    });
-  } else {
-    socket.destroy();
-  }
-});
-
-server.listen(8080);
-```
-
-### Client authentication
-
-```js
-import { createServer } from 'http';
-import { WebSocketServer } from 'ws';
-
-const server = createServer();
-const wss = new WebSocketServer({ noServer: true });
-
-wss.on('connection', function connection(ws, request, client) {
-  ws.on('message', function message(data) {
-    console.log(`Received message ${data} from user ${client}`);
-  });
-});
-
-server.on('upgrade', function upgrade(request, socket, head) {
-  // This function is not defined on purpose. Implement it with your own logic.
-  authenticate(request, function next(err, client) {
-    if (err || !client) {
-      socket.write('HTTP/1.1 401 Unauthorized\r\n\r\n');
-      socket.destroy();
-      return;
-    }
-
-    wss.handleUpgrade(request, socket, head, function done(ws) {
-      wss.emit('connection', ws, request, client);
-    });
-  });
-});
-
-server.listen(8080);
-```
-
-Also see the provided [example][session-parse-example] using `express-session`.
-
-### Server broadcast
-
-A client WebSocket broadcasting to all connected WebSocket clients, including
-itself.
-
-```js
-import WebSocket, { WebSocketServer } from 'ws';
-
-const wss = new WebSocketServer({ port: 8080 });
-
-wss.on('connection', function connection(ws) {
-  ws.on('message', function message(data, isBinary) {
-    wss.clients.forEach(function each(client) {
-      if (client.readyState === WebSocket.OPEN) {
-        client.send(data, { binary: isBinary });
-      }
-    });
-  });
-});
-```
-
-A client WebSocket broadcasting to every other connected WebSocket clients,
-excluding itself.
-
-```js
-import WebSocket, { WebSocketServer } from 'ws';
-
-const wss = new WebSocketServer({ port: 8080 });
-
-wss.on('connection', function connection(ws) {
-  ws.on('message', function message(data, isBinary) {
-    wss.clients.forEach(function each(client) {
-      if (client !== ws && client.readyState === WebSocket.OPEN) {
-        client.send(data, { binary: isBinary });
-      }
-    });
-  });
-});
-```
-
-### Round-trip time
-
-```js
-import WebSocket from 'ws';
-
-const ws = new WebSocket('wss://websocket-echo.com/');
-
-ws.on('open', function open() {
-  console.log('connected');
-  ws.send(Date.now());
-});
-
-ws.on('close', function close() {
-  console.log('disconnected');
-});
-
-ws.on('message', function message(data) {
-  console.log(`Round-trip time: ${Date.now() - data} ms`);
-
-  setTimeout(function timeout() {
-    ws.send(Date.now());
-  }, 500);
-});
-```
-
-### Use the Node.js streams API
-
-```js
-import WebSocket, { createWebSocketStream } from 'ws';
-
-const ws = new WebSocket('wss://websocket-echo.com/');
-
-const duplex = createWebSocketStream(ws, { encoding: 'utf8' });
-
-duplex.pipe(process.stdout);
-process.stdin.pipe(duplex);
-```
-
-### Other examples
-
-For a full example with a browser client communicating with a ws server, see the
-examples folder.
-
-Otherwise, see the test cases.
-
-## FAQ
-
-### How to get the IP address of the client?
-
-The remote IP address can be obtained from the raw socket.
-
-```js
-import { WebSocketServer } from 'ws';
-
-const wss = new WebSocketServer({ port: 8080 });
-
-wss.on('connection', function connection(ws, req) {
-  const ip = req.socket.remoteAddress;
-});
-```
-
-When the server runs behind a proxy like NGINX, the de-facto standard is to use
-the `X-Forwarded-For` header.
-
-```js
-wss.on('connection', function connection(ws, req) {
-  const ip = req.headers['x-forwarded-for'].split(',')[0].trim();
-});
-```
-
-### How to detect and close broken connections?
-
-Sometimes the link between the server and the client can be interrupted in a way
-that keeps both the server and the client unaware of the broken state of the
-connection (e.g. when pulling the cord).
-
-In these cases ping messages can be used as a means to verify that the remote
-endpoint is still responsive.
-
-```js
-import { WebSocketServer } from 'ws';
-
-function heartbeat() {
-  this.isAlive = true;
-}
-
-const wss = new WebSocketServer({ port: 8080 });
-
-wss.on('connection', function connection(ws) {
-  ws.isAlive = true;
-  ws.on('pong', heartbeat);
-});
-
-const interval = setInterval(function ping() {
-  wss.clients.forEach(function each(ws) {
-    if (ws.isAlive === false) return ws.terminate();
-
-    ws.isAlive = false;
-    ws.ping();
-  });
-}, 30000);
-
-wss.on('close', function close() {
-  clearInterval(interval);
-});
-```
-
-Pong messages are automatically sent in response to ping messages as required by
-the spec.
-
-Just like the server example above your clients might as well lose connection
-without knowing it. You might want to add a ping listener on your clients to
-prevent that. A simple implementation would be:
-
-```js
-import WebSocket from 'ws';
-
-function heartbeat() {
-  clearTimeout(this.pingTimeout);
-
-  // Use `WebSocket#terminate()`, which immediately destroys the connection,
-  // instead of `WebSocket#close()`, which waits for the close timer.
-  // Delay should be equal to the interval at which your server
-  // sends out pings plus a conservative assumption of the latency.
-  this.pingTimeout = setTimeout(() => {
-    this.terminate();
-  }, 30000 + 1000);
-}
-
-const client = new WebSocket('wss://websocket-echo.com/');
-
-client.on('open', heartbeat);
-client.on('ping', heartbeat);
-client.on('close', function clear() {
-  clearTimeout(this.pingTimeout);
-});
-```
-
-### How to connect via a proxy?
-
-Use a custom `http.Agent` implementation like [https-proxy-agent][] or
-[socks-proxy-agent][].
-
-## Changelog
-
-We're using the GitHub [releases][changelog] for changelog entries.
-
-## License
-
-[MIT](LICENSE)
-
-[changelog]: https://github.com/websockets/ws/releases
-[client-report]: http://websockets.github.io/ws/autobahn/clients/
-[https-proxy-agent]: https://github.com/TooTallNate/node-https-proxy-agent
-[node-zlib-bug]: https://github.com/nodejs/node/issues/8871
-[node-zlib-deflaterawdocs]:
-  https://nodejs.org/api/zlib.html#zlib_zlib_createdeflateraw_options
-[permessage-deflate]: https://tools.ietf.org/html/rfc7692
-[server-report]: http://websockets.github.io/ws/autobahn/servers/
-[session-parse-example]: ./examples/express-session-parse
-[socks-proxy-agent]: https://github.com/TooTallNate/node-socks-proxy-agent
-[ws-server-options]: ./doc/ws.md#new-websocketserveroptions-callback