Websocket PHP - 400 Bad Request

I run a websocket server proxied via Cloudflare. Connecting to it via javascript works but when i trie to connect to it via php I get a 400 bad request result.

The port i am using is 2053 and the connection uses stream_socket_client


stream_socket_client('ssl://mydomain.com:2053', $errno, $errstr, ini_get("default_socket_timeout"), STREAM_CLIENT_CONNECT, $context);

This is the result (cli)

string(316) "HTTP/1.1 400 Bad Request
Server: cloudflare
Date: Mon, 22 Jan 2024 13:49:26 GMT
Content-Type: text/html
Content-Length: 155
Connection: close

<head><title>400 Bad Request</title></head>
<center><h1>400 Bad Request</h1></center>

I have enabled websockets in Cloudflare

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