[99s-extend] Mandatory init/3 and optional handle/2 and terminate/3

[Paulo F. Oliveira]

Hello.

You wrote here <http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/>
that
"The only mandatory callback is init/3, needed to perform the protocol
upgrade."

In my code I have only this function for the protocol upgrade:

init({_TransportName, _ProtocolName}, _Req, []) ->
    {upgrade, protocol, cowboy_rest}.

On the other hand, when compiling, I get the following warnings:

src/handler_transactions.erl:3: Warning: undefined callback function
handle/2 (behaviour 'cowboy_http_handler')
src/handler_transactions.erl:3: Warning: undefined callback function
terminate/3 (behaviour 'cowboy_http_handler')

Is this the expected behavior? I know I _can_ ignore the warnings, but not
if I want to use Erlang compiler option warnings_as_errors, for example.

Many thanks.

- Paulo F. Oliveira
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