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-
-# socket.io
-
-[![Build Status](https://secure.travis-ci.org/socketio/socket.io.svg)](https://travis-ci.org/socketio/socket.io)
-[![Dependency Status](https://david-dm.org/socketio/socket.io.svg)](https://david-dm.org/socketio/socket.io)
-[![devDependency Status](https://david-dm.org/socketio/socket.io/dev-status.svg)](https://david-dm.org/socketio/socket.io#info=devDependencies)
-![NPM version](https://badge.fury.io/js/socket.io.svg)
-![Downloads](https://img.shields.io/npm/dm/socket.io.svg?style=flat)
-[![](http://slack.socket.io/badge.svg?)](http://slack.socket.io)
-
-## How to use
-
-The following example attaches socket.io to a plain Node.JS
-HTTP server listening on port `3000`.
-
-```js
-var server = require('http').createServer();
-var io = require('socket.io')(server);
-io.on('connection', function(socket){
-  socket.on('event', function(data){});
-  socket.on('disconnect', function(){});
-});
-server.listen(3000);
-```
-
-### Standalone
-
-```js
-var io = require('socket.io')();
-io.on('connection', function(socket){});
-io.listen(3000);
-```
-
-### In conjunction with Express
-
-Starting with **3.0**, express applications have become request handler
-functions that you pass to `http` or `http` `Server` instances. You need
-to pass the `Server` to `socket.io`, and not the express application
-function.
-
-```js
-var app = require('express')();
-var server = require('http').createServer(app);
-var io = require('socket.io')(server);
-io.on('connection', function(){ /* … */ });
-server.listen(3000);
-```
-
-### In conjunction with Koa
-
-Like Express.JS, Koa works by exposing an application as a request
-handler function, but only by calling the `callback` method.
-
-```js
-var app = require('koa')();
-var server = require('http').createServer(app.callback());
-var io = require('socket.io')(server);
-io.on('connection', function(){ /* … */ });
-server.listen(3000);
-```
-
-## API
-
-### Server
-
-  Exposed by `require('socket.io')`.
-
-### Server()
-
-  Creates a new `Server`. Works with and without `new`:
-
-  ```js
-  var io = require('socket.io')();
-  // or
-  var Server = require('socket.io');
-  var io = new Server();
-  ```
-
-### Server(opts:Object)
-
-  Optionally, the first or second argument (see below) of the `Server`
-  constructor can be an options object.
-
-  The following options are supported:
-
-  - `serveClient` sets the value for Server#serveClient()
-  - `path` sets the value for Server#path()
-
-  The same options passed to socket.io are always passed to
-  the `engine.io` `Server` that gets created. See engine.io
-  [options](https://github.com/socketio/engine.io#methods-1)
-  as reference.
-
-### Server(srv:http#Server, opts:Object)
-
-  Creates a new `Server` and attaches it to the given `srv`. Optionally
-  `opts` can be passed.
-
-### Server(port:Number, opts:Object)
-
-  Binds socket.io to a new `http.Server` that listens on `port`.
-
-### Server#serveClient(v:Boolean):Server
-
-  If `v` is `true` the attached server (see `Server#attach`) will serve
-  the client files. Defaults to `true`.
-
-  This method has no effect after `attach` is called.
-
-  ```js
-  // pass a server and the `serveClient` option
-  var io = require('socket.io')(http, { serveClient: false });
-
-  // or pass no server and then you can call the method
-  var io = require('socket.io')();
-  io.serveClient(false);
-  io.attach(http);
-  ```
-
-  If no arguments are supplied this method returns the current value.
-
-### Server#path(v:String):Server
-
-  Sets the path `v` under which `engine.io` and the static files will be
-  served. Defaults to `/socket.io`.
-
-  If no arguments are supplied this method returns the current value.
-
-### Server#adapter(v:Adapter):Server
-
-  Sets the adapter `v`. Defaults to an instance of the `Adapter` that
-  ships with socket.io which is memory based. See
-  [socket.io-adapter](https://github.com/socketio/socket.io-adapter).
-
-  If no arguments are supplied this method returns the current value.
-
-### Server#origins(v:String):Server
-
-  Sets the allowed origins `v`. Defaults to any origins being allowed.
-
-  If no arguments are supplied this method returns the current value.
-
-### Server#origins(v:Function):Server
-
-  Sets the allowed origins as dynamic function. Function takes two arguments `origin:String` and `callback(error, success)`, where `success` is a boolean value indicating whether origin is allowed or not.
-
-  __Potential drawbacks__:
-  * in some situations, when it is not possible to determine `origin` it may have value of `*`
-  * As this function will be executed for every request, it is advised to make this function work as fast as possible
-  * If `socket.io` is used together with `Express`, the CORS headers will be affected only for `socket.io` requests. For Express can use [cors](https://github.com/expressjs/cors)
-
-
-### Server#sockets:Namespace
-
-  The default (`/`) namespace.
-
-### Server#attach(srv:http#Server, opts:Object):Server
-
-  Attaches the `Server` to an engine.io instance on `srv` with the
-  supplied `opts` (optionally).
-
-### Server#attach(port:Number, opts:Object):Server
-
-  Attaches the `Server` to an engine.io instance that is bound to `port`
-  with the given `opts` (optionally).
-
-### Server#listen
-
-  Synonym of `Server#attach`.
-
-### Server#bind(srv:engine#Server):Server
-
-  Advanced use only. Binds the server to a specific engine.io `Server`
-  (or compatible API) instance.
-
-### Server#onconnection(socket:engine#Socket):Server
-
-  Advanced use only. Creates a new `socket.io` client from the incoming
-  engine.io (or compatible API) `socket`.
-
-### Server#of(nsp:String):Namespace
-
-  Initializes and retrieves the given `Namespace` by its pathname
-  identifier `nsp`.
-
-  If the namespace was already initialized it returns it right away.
-
-### Server#emit
-
-  Emits an event to all connected clients. The following two are
-  equivalent:
-
-  ```js
-  var io = require('socket.io')();
-  io.sockets.emit('an event sent to all connected clients');
-  io.emit('an event sent to all connected clients');
-  ```
-
-  For other available methods, see `Namespace` below.
-
-### Server#close
-
-  Closes socket server
-
-  ```js
-  var Server = require('socket.io');
-  var PORT   = 3030;
-  var server = require('http').Server();
-
-  var io = Server(PORT);
-
-  io.close(); // Close current server
-
-  server.listen(PORT); // PORT is free to use
-
-  io = Server(server);
-  ```
-
-### Server#use
-
-  See `Namespace#use` below.
-
-### Namespace
-
-  Represents a pool of sockets connected under a given scope identified
-  by a pathname (eg: `/chat`).
-
-  By default the client always connects to `/`.
-
-#### Events
-
-  - `connection` / `connect`. Fired upon a connection.
-
-    Parameters:
-    - `Socket` the incoming socket.
-
-### Namespace#name:String
-
-  The namespace identifier property.
-
-### Namespace#connected:Object<Socket>
-
-  Hash of `Socket` objects that are connected to this namespace indexed
-  by `id`.
-
-### Namespace#clients(fn:Function)
-
-  Gets a list of client IDs connected to this namespace (across all nodes if applicable).
-
-  An example to get all clients in a namespace:
-
-  ```js
-  var io = require('socket.io')();
-  io.of('/chat').clients(function(error, clients){
-    if (error) throw error;
-    console.log(clients); // => [PZDoMHjiu8PYfRiKAAAF, Anw2LatarvGVVXEIAAAD]
-  });
-  ```
-
-  An example to get all clients in namespace's room:
-
-  ```js
-  var io = require('socket.io')();
-  io.of('/chat').in('general').clients(function(error, clients){
-    if (error) throw error;
-    console.log(clients); // => [Anw2LatarvGVVXEIAAAD]
-  });
-  ```
-
-  As with broadcasting, the default is all clients from the default namespace ('/'):
-
-  ```js
-  var io = require('socket.io')();
-  io.clients(function(error, clients){
-    if (error) throw error;
-    console.log(clients); // => [6em3d4TJP8Et9EMNAAAA, G5p55dHhGgUnLUctAAAB]
-  });
-  ```
-
-### Namespace#use(fn:Function):Namespace
-
-  Registers a middleware, which is a function that gets executed for
-  every incoming `Socket` and receives as parameter the socket and a
-  function to optionally defer execution to the next registered
-  middleware.
-
-  ```js
-  var io = require('socket.io')();
-  io.use(function(socket, next){
-    if (socket.request.headers.cookie) return next();
-    next(new Error('Authentication error'));
-  });
-  ```
-
-  Errors passed to middleware callbacks are sent as special `error`
-  packets to clients.
-
-### Socket
-
-  A `Socket` is the fundamental class for interacting with browser
-  clients. A `Socket` belongs to a certain `Namespace` (by default `/`)
-  and uses an underlying `Client` to communicate.
-
-### Socket#rooms:Object
-
-  A hash of strings identifying the rooms this socket is in, indexed by
-  room name.
-
-### Socket#client:Client
-
-  A reference to the underlying `Client` object.
-
-### Socket#conn:Socket
-
-  A reference to the underlying `Client` transport connection (engine.io
-  `Socket` object).
-
-### Socket#request:Request
-
-  A getter proxy that returns the reference to the `request` that
-  originated the underlying engine.io `Client`. Useful for accessing
-  request headers such as `Cookie` or `User-Agent`.
-
-### Socket#id:String
-
-  A unique identifier for the socket session, that comes from the
-  underlying `Client`.
-
-### Socket#emit(name:String[, …]):Socket
-
-  Emits an event to the socket identified by the string `name`. Any
-  other parameters can be included.
-
-  All datastructures are supported, including `Buffer`. JavaScript
-  functions can't be serialized/deserialized.
-
-  ```js
-  var io = require('socket.io')();
-  io.on('connection', function(socket){
-    socket.emit('an event', { some: 'data' });
-  });
-  ```
-
-### Socket#join(name:String[, fn:Function]):Socket
-
-  Adds the socket to the `room`, and fires optionally a callback `fn`
-  with `err` signature (if any).
-
-  The socket is automatically a member of a room identified with its
-  session id (see `Socket#id`).
-
-  The mechanics of joining  rooms are handled by the `Adapter`
-  that has been configured (see `Server#adapter` above), defaulting to
-  [socket.io-adapter](https://github.com/socketio/socket.io-adapter).
-
-### Socket#leave(name:String[, fn:Function]):Socket
-
-  Removes the socket from `room`, and fires optionally a callback `fn`
-  with `err` signature (if any).
-
-  **Rooms are left automatically upon disconnection**.
-
-  The mechanics of leaving rooms are handled by the `Adapter`
-  that has been configured (see `Server#adapter` above), defaulting to
-  [socket.io-adapter](https://github.com/socketio/socket.io-adapter).
-
-### Socket#to(room:String):Socket
-
-  Sets a modifier for a subsequent event emission that the event will
-  only be _broadcasted_ to sockets that have joined the given `room`.
-
-  To emit to multiple rooms, you can call `to` several times.
-
-  ```js
-  var io = require('socket.io')();
-  io.on('connection', function(socket){
-    socket.to('others').emit('an event', { some: 'data' });
-  });
-  ```
-
-### Socket#in(room:String):Socket
-
-  Same as `Socket#to`
-
-### Socket#compress(v:Boolean):Socket
-
-  Sets a modifier for a subsequent event emission that the event data will
-  only be _compressed_ if the value is `true`. Defaults to `true` when you don't call the method.
-
-  ```js
-  var io = require('socket.io')();
-  io.on('connection', function(socket){
-    socket.compress(false).emit('an event', { some: 'data' });
-  });
-  ```
-
-### Client
-
-  The `Client` class represents an incoming transport (engine.io)
-  connection. A `Client` can be associated with many multiplexed `Socket`
-  that belong to different `Namespace`s.
-
-### Client#conn
-
-  A reference to the underlying `engine.io` `Socket` connection.
-
-### Client#request
-
-  A getter proxy that returns the reference to the `request` that
-  originated the engine.io connection. Useful for accessing
-  request headers such as `Cookie` or `User-Agent`.
-
-## Debug / logging
-
-Socket.IO is powered by [debug](https://github.com/visionmedia/debug).
-In order to see all the debug output, run your app with the environment variable
-`DEBUG` including the desired scope.
-
-To see the output from all of Socket.IO's debugging scopes you can use:
-
-```
-DEBUG=socket.io* node myapp
-```
-
-## License
-
-MIT