DL303 Unexpected protocol upgrade

502. The service answered 101 Switching Protocols to a request that did not ask for an upgrade, which the client cannot accept. WebSocket requests ask for one and are not affected. This is a bug in the service or one of its libraries.

Check the service’s upgrade handling and output:

devlanes logs acme@2:web --tail 100

If devlanes is at fault, open an issue with a request that reproduces it.