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-The Websocket protocol
-======================
-
-This chapter explains what Websocket is and why it is
-a vital component of soft realtime Web applications.
-
-Description
------------
-
-Websocket is an extension to HTTP that emulates plain TCP
-connections between the client, typically a Web browser,
-and the server. It uses the HTTP Upgrade mechanism to
-establish the connection.
-
-Websocket connections are asynchronous, unlike HTTP. This
-means that not only can the client send frames to the server
-at any time, but the server can also send frames to the client
-without the client initiating anything other than the
-Websocket connection itself. This allows the server to push
-data to the client directly.
-
-Websocket is an IETF standard. Cowboy supports the standard
-and all drafts that were previously implemented by browsers,
-excluding the initial flawed draft sometimes known as
-"version 0".
-
-Implementation
---------------
-
-Cowboy implements Websocket as a protocol upgrade. Once the
-upgrade is performed from the `init/3` callback, Cowboy
-switches to Websocket. Please consult the next chapter for
-more information on initiating and handling Websocket
-connections.
-
-The implementation of Websocket in Cowboy is validated using
-the Autobahn test suite, which is an extensive suite of tests
-covering all aspects of the protocol. Cowboy passes the
-suite with 100% success, including all optional tests.
-
-Cowboy's Websocket implementation also includes the
-x-webkit-deflate-frame compression draft which is being used
-by some browsers to reduce the size of data being transmitted.
-Cowboy will automatically use compression as long as the
-`compress` protocol option is set when starting the listener.