pywsgi.WSGIServer SSL Certificate eroor with Flask

I generated a ssl certificate with openssl and wanted to add it to flask.

if __name__ == '__main__':    http_server = pywsgi.WSGIServer(('0.0.0.0', 5000), app, keyfile='server.key', certfile='server.crt')    http_server.serve_forever()

But when I request the ip of the server I get the error

ssl.SSLError: [SSL] PEM lib (_ssl.c:3874)2024-04-27T13:03:44Z <Greenlet at 0x199436caac0: _handle_and_close_when_done(<bound method StreamServer.wrap_socket_and_handle , <bound method StreamServer.do_close of <WSGIServer, (<gevent._socket3.socket [closed] at 0x1994370ab00)> failed with SSLError

I expected beingable to request the server under https://{serverIP}:5000/