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cowboy_http_handler
===================
The `cowboy_http_handler` behaviour defines the interface used
by plain HTTP handlers.
Unless noted otherwise, the callbacks will be executed sequentially.
Types
-----
None.
Callbacks
---------
### init({TransportName, ProtocolName}, Req, Opts)
-> {ok, Req, State} | {shutdown, Req, State}
> Types:
> * TransportName = tcp | ssl | atom()
> * ProtocolName = http | atom()
> * Req = cowboy_req:req()
> * Opts = any()
> * State = any()
>
> Initialize the state for this request.
>
> The `shutdown` return value can be used to skip the `handle/2`
> call entirely.
### handle(Req, State) -> {ok, Req, State}
> Types:
> * Req = cowboy_req:req()
> * State = any()
>
> Handle the request.
>
> This callback is where the request is handled and a response
> should be sent. If a response is not sent, Cowboy will send
> a `204 No Content` response automatically.
### terminate(Reason, Req, State) -> ok
> Types:
> * Reason = {normal, shutdown} | {error, atom()}
> * Req = cowboy_req:req()
> * State = any()
>
> Perform any necessary cleanup of the state.
>
> This callback should release any resource currently in use,
> clear any active timer and reset the process to its original
> state, as it might be reused for future requests sent on the
> same connection. Typical plain HTTP handlers rarely need to
> use it.
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