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-[[ws_protocol]]
-== 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 fully asynchronous, unlike
-HTTP/1.1 (synchronous) and HTTP/2 (asynchronous, but the
-server can only initiate streams in response to requests).
-With Websocket, the client and the server can both send
-frames at any time without any restriction. It is closer
-to TCP than any of the HTTP protocols.
-
-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".
-
-=== Websocket vs HTTP/2
-
-For a few years Websocket was the only way to have a
-bidirectional asynchronous connection with the server.
-This changed when HTTP/2 was introduced. While HTTP/2
-requires the client to first perform a request before
-the server can push data, this is only a minor restriction
-as the client can do so just as it connects.
-
-Websocket was designed as a kind-of-TCP channel to a
-server. It only defines the framing and connection
-management and lets the developer implement a protocol
-on top of it. For example you could implement IRC over
-Websocket and use a Javascript IRC client to speak to
-the server.
-
-HTTP/2 on the other hand is just an improvement over
-the HTTP/1.1 connection and request/response mechanism.
-It has the same semantics as HTTP/1.1.
-
-If all you need is to access an HTTP API, then HTTP/2
-should be your first choice. On the other hand, if what
-you need is a different protocol, then you can use
-Websocket to implement it.
-
-=== Implementation
-
-Cowboy implements Websocket as a protocol upgrade. Once the
-upgrade is performed from the `init/2` 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
-permessage-deflate and x-webkit-deflate-frame compression
-extensions.
-
-Cowboy will automatically use compression when the
-`compress` option is returned from the `init/2` function.