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+cowboy
+======
+
+The `cowboy` module provides convenience functions for
+manipulating Ranch listeners.
+
+Types
+-----
+
+### http_headers() = [{binary(), iodata()}]
+
+> HTTP headers as a list of key/values.
+
+### http_status() = non_neg_integer() | binary()
+
+> HTTP status.
+>
+> A binary status can be used to set a custom message.
+
+### http_version() = 'HTTP/1.1' | 'HTTP/1.0'
+
+> HTTP version.
+
+### onrequest_fun() = fun((cowboy_req:req()) -> cowboy_req:req())
+
+> Fun called immediately after receiving a request.
+>
+> It can perform any operation on the `Req` object, including
+> reading the request body or replying. If a reply is sent,
+> the processing of the request ends here, before any middleware
+> is executed.
+
+### onresponse_fun() = fun((http_status(), http_headers(),
+	iodata(), cowboy_req:req()) -> cowboy_req:req())
+
+> Fun called immediately before sending the response.
+>
+> It can perform any operation on the `Req` object, including
+> reading the request body or replying. If a reply is sent, it
+> overrides the reply initially sent. The callback will not be
+> called again for the new reply.
+
+Exports
+-------
+
+### start_http(Ref, NbAcceptors, TransOpts, ProtoOpts) -> {ok, pid()}
+
+> Types:
+>  *  Ref = ranch:ref()
+>  *  NbAcceptors = non_neg_integer()
+>  *  TransOpts = ranch_tcp:opts()
+>  *  ProtoOpts = cowboy_protocol:opts()
+>
+> Start listening for HTTP connections. Returns the pid for this
+> listener's supervisor.
+
+### start_https(Ref, NbAcceptors, TransOpts, ProtoOpts) -> {ok, pid()}
+
+> Types:
+>  *  Ref = ranch:ref()
+>  *  NbAcceptors = non_neg_integer()
+>  *  TransOpts = ranch_ssl:opts()
+>  *  ProtoOpts = cowboy_protocol:opts()
+>
+> Start listening for HTTPS connections. Returns the pid for this
+> listener's supervisor.
+
+### stop_listener(Ref) -> ok
+
+> Types:
+>  *  Ref = ranch:ref()
+>
+> Stop a previously started listener.
+
+### set_env(Ref, Name, Value) -> ok
+
+> Types:
+>  *  Ref = ranch:ref()
+>  *  Name = atom()
+>  *  Value = any()
+>
+> Set or update an environment value for an already running listener.
+> This will take effect on all subsequent connections.
+
+See also
+--------
+
+The [Ranch guide](http://ninenines.eu/docs/en/ranch/HEAD/guide)
+provides detailed information about how listeners work.