I am looking for a method to write a simple proxy in flask for ttyd which is an open-source web terminal(https://github.com/tsl0922/ttyd). The most immediate way is to read client request and relay to ttyd server. However, it fails when the websocket is connecting. My view function is as follows:
@app.route('/')
@app.route('/auth_token.js')
@app.route('/ws')
def ttyd():
if request.path=='/ws':
url = 'ws://192.168.123.172:7681' + request.path
else:
url = 'http://192.168.123.172:7681' + request.path
method = request.method
data = request.data or request.form or None
cookies = request.cookies
headers = request.headers
with closing(
requests.request(method, url, headers=headers, data=data, cookies=cookies)
) as r:
resp_headers = []
for name, value in r.headers.items():
resp_headers.append((name, value))
return Response(r, status=r.status_code, headers=resp_headers)
As you can see, the view function will handle 3 url requests, the first two succeed with status code 200, the third fails with status code 500. The error code in server side is as follows: requests.exceptions.InvalidSchema: No connection adapters were found for 'ws://192.168.123.172:7681/ws'
I also check the network in two cases(with/without proxy). The picture 'without proxy' means direct type 'http://192.168.123.172:7681', it succeeds. The picture 'with proxy' means access ttyd server with flask proxy, it fails.
Without proxy
With proxy
Since I am new to flask and websocket, I am confused about the result. The sHTTPe flask proxy can handle any other http request(e.g. access google.com) but fails in WebSocket connection.
Thank you for telling me why and how can I fix it?
