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%% Feel free to use, reuse and abuse the code in this file.
%% @doc GET echo handler.
-module(toppage_handler).
-export([init/2]).
init(Req0, Opts) ->
Method = cowboy_req:method(Req0),
#{echo := Echo} = cowboy_req:match_qs([{echo, [], undefined}], Req0),
Req = echo(Method, Echo, Req0),
{ok, Req, Opts}.
echo(<<"GET">>, undefined, Req) ->
cowboy_req:reply(400, #{}, <<"Missing echo parameter.">>, Req);
echo(<<"GET">>, Echo, Req) ->
cowboy_req:reply(200, #{
<<"content-type">> => <<"text/plain; charset=utf-8">>
}, Echo, Req);
echo(_, _, Req) ->
%% Method not allowed.
cowboy_req:reply(405, Req).
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