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<?php var_dump(stream_socket_client('udp://127.0.0.1:13', $errorCode, $errorMessage), $errorCode, $errorMessage);
Output for git.master, git.master_jit
Warning: stream_socket_client(): Unable to connect to udp://127.0.0.1:13 (Unknown error) in /in/TmSQQ on line 3 bool(false) int(0) string(0) ""

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