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cowboy/test/handlers/send_message_h.erl

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%% This module sends a message to the pid passed in a header.
-module(send_message_h).
-export([init/2]).
init(Req, State) ->
Pid = list_to_pid(binary_to_list(cowboy_req:header(<<"x-test-pid">>, Req))),
Pid ! {Pid, self(), init, Req, State},
{ok, cowboy_req:reply(200, Req), State}.