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-Handling plain HTTP requests
-============================
-
-The simplest way to handle a request is by writing a
-plain HTTP handler. It is modeled after Erlang/OTP's
-gen_server behaviour, although simplified, as Cowboy
-will simply call the three callbacks sequentially.
-
-Initialization
---------------
-
-The first callback, `init/3`, is common to all handlers,
-as it is used to identify the type of handler. Plain
-HTTP handlers just return `ok`.
-
-``` erlang
-init(_Type, Req, _Opts) ->
-    {ok, Req, no_state}.
-```
-
-This function receives the name of the transport and
-protocol modules used for processing the request.
-They can be used to quickly dismiss requests. For
-example the following handler will crash when accessed
-using TCP instead of SSL.
-
-``` erlang
-init({ssl, _}, Req, _Opts) ->
-    {ok, Req, no_state}.
-```
-
-This function also receives the options associated with
-this route that you configured previously. If your
-handler does not use options, then it is recommended
-you match the value `[]` directly to quickly detect
-configuration errors.
-
-``` erlang
-init(_Type, Req, []) ->
-    {ok, Req, no_state}.
-```
-
-You do not need to validate the options unless they
-are user configured. If they are, and there's a
-configuration error, you may choose to crash. For
-example, this will crash if the required `lang`
-option is not found.
-
-``` erlang
-init(_Type, Req, Opts) ->
-    {_, _Lang} = lists:keyfind(lang, 1, Opts),
-    {ok, Req, no_state}.
-```
-
-If your users are unlikely to figure out the issue
-without explanations, then you should send a more
-meaningful error back to the user. Since we already
-replied to the user, there's no need for us to
-continue with the handler code, so we use the
-`shutdown` return value to stop early.
-
-``` erlang
-init(_Type, Req, Opts) ->
-    case lists:keyfind(lang, 1, Opts) of
-        false ->
-            {ok, Req2} = cowboy_req:reply(500, [
-                {<<"content-type">>, <<"text/plain">>}
-            ], "Missing option 'lang'.", Req),
-            {shutdown, Req2, no_state};
-        _ ->
-            {ok, Req, no_state}
-    end.
-```
-
-Once the options have been validated, we can use them
-safely. So we need to pass them onward to the rest of
-the handler. That's what the third element of the return
-tuple, the state, is for.
-
-We recommend that you create a state record for this.
-The record will make your handler code clearer and
-will allow you to better use Dialyzer for type checking.
-
-``` erlang
--record(state, {
-    lang :: en | fr
-    %% More fields here.
-}).
-
-init(_Type, Req, Opts) ->
-    {_, Lang} = lists:keyfind(lang, 1, Opts),
-    {ok, Req, #state{lang=Lang}}.
-```
-
-Handling the request
---------------------
-
-The second callback, `handle/2`, is specific to plain HTTP
-handlers. It's where you, wait for it, handle the request.
-
-A handle function that does nothing would look like this:
-
-``` erlang
-handle(Req, State) ->
-    {ok, Req, State}.
-```
-
-There's no other return value. To obtain information about
-the request, or send a response, you would use the Req object
-here. The Req object is documented in its own chapter.
-
-The following handle function will send a fairly original response.
-
-``` erlang
-handle(Req, State) ->
-    {ok, Req2} = cowboy_req:reply(200, [
-        {<<"content-type">>, <<"text/plain">>}
-    ], <<"Hello World!">>, Req),
-    {ok, Req2, State}.
-```
-
-Cleaning up
------------
-
-The third and last callback, `terminate/3`, will most likely
-be empty in your handler.
-
-``` erlang
-terminate(_Reason, Req, State) ->
-    ok.
-```
-
-This callback is strictly reserved for any required cleanup.
-You cannot send a response from this function. There is no
-other return value.
-
-If you used the process dictionary, timers, monitors or may
-be receiving messages, then you can use this function to clean
-them up, as Cowboy might reuse the process for the next
-keep-alive request.
-
-The chances of any of this happening in your handler are pretty
-thin however. The use of the process dictionary is discouraged
-in Erlang code in general. And if you need to use timers, monitors
-or to receive messages, you are better off with a loop handler,
-a different kind of handler meant specifically for this use.
-
-This function is still available should you need it. It will
-always be called.