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-cowboy_sub_protocol
-===================
-
-The `cowboy_sub_protocol` behaviour defines the interface used
-by modules that implement a protocol on top of HTTP.
-
-Types
------
-
-None.
-
-Callbacks
----------
-
-### upgrade(Req, Env, Handler, Opts)
-	-> {ok, Req, Env}
-	| {suspend, Module, Function, Args}
-	| {halt, Req}
-	| {error, StatusCode, Req}
-
-> Types:
->  *  Req = cowboy_req:req()
->  *  Env = env()
->  *  Handler = module()
->  *  Opts = any()
->  *  Module = module()
->  *  Function = atom()
->  *  Args = [any()]
->  *  StatusCode = cowboy:http_status()
->
-> Upgrade the protocol.
->
-> Please refer to the `cowboy_middleware` manual for a
-> description of the return values.