%% Feel free to use, reuse and abuse the code in this file. %% @doc GET echo handler. -module(toppage_h). -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).