fix: support both old and new websockets request headers format #1588
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Add compatibility check for request_headers format in websocket handling. New version of websockets has a 'headers' attribute in request_headers, while old version uses request_headers directly.
This change ensures the server can properly handle requests from different versions of the websockets library.
In older versions of python 3.8 websockets, Headers class was located at websockets.datastructures.Headers
In newer versions of python 3.10 websockets, Headers class was moved to websockets.http11.Request