Server crash
https://github.com/ratchetphp/Ratchet/blob/5012dc954541b40c5599d286fd40653f5716a38f/src/Ratchet/Http/HttpServer.php#L45

sending malformed headers to socket server will crash the server. like sending headers with _integer_ keys

$haders = [1=>'test'];

I think "OverflowException" should be replaced with "Throwable" in order to solve this problem