add a python websocket proxy which works on Linux, while ws proxy_server does not

test/compatibility/python/websockets/ws_proxy.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+# WS server example
+
+import argparse
+import asyncio
+import websockets
+
+
+async def hello(websocket, path):
+
+    url = REMOTE_URL + path
+    async with websockets.connect(url) as ws:
+        taskA = asyncio.create_task(clientToServer(ws, websocket))
+        taskB = asyncio.create_task(serverToClient(ws, websocket))
+
+        await taskA
+        await taskB
+
+
+async def clientToServer(ws, websocket):
+    async for message in ws:
+        await websocket.send(message)
+
+
+async def serverToClient(ws, websocket):
+    async for message in websocket:
+        await ws.send(message)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='websocket proxy.')
+    parser.add_argument('--host', help='Host to bind to.', default='localhost')
+    parser.add_argument('--port', help='Port to bind to.', default=8765)
+    parser.add_argument('--remote_url', help='Remote websocket url', default='ws://localhost:8767')
+    args = parser.parse_args()
+
+    REMOTE_URL = args.remote_url
+
+    start_server = websockets.serve(hello, args.host, args.port)
+
+    asyncio.get_event_loop().run_until_complete(start_server)
+    asyncio.get_event_loop().run_forever()