Any ideas as to what might be causing this h2 error My flow

Question

Any ideas as to what might be causing this h2 error My flow and many tasks run successfully Then the following task seems to produce the failure both in thread The task itself is mapped with a concurrency limit of 8 Thousands of api calls are being made I have not found any other error messages in the logs so far but I m continuing to look

Stephen Lloyd · Answer

```def loading creds Dict task list List gt List workstream id = creds workstream id api key = creds workstream api key error response list = api = etl TaskCompletedApi run env workstream id api key for task in task list try response = api request task if response json message = Data successfully received error response list append task except error response list append task return error response list```

Stephen Lloyd · Answer

```Crash detected Execution was interrupted by an unexpected exception Traceback most recent call last File usr local lib python3 11 site packages h2 connection py line 224 in process input func target state = self transitions self state input ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^ KeyError lt ConnectionState CLOSED 3 gt lt ConnectionInputs SEND HEADERS 0 gt During handling of the above exception another exception occurred Traceback most recent call last File usr local lib python3 11 site packages httpcore async http2 py line 116 in handle async request await self send request headers request=request stream id=stream id File usr local lib python3 11 site packages httpcore async http2 py line 213 in send request headers self h2 state send headers stream id headers end stream=end stream File usr local lib python3 11 site packages h2 connection py line 766 in send headers self state machine process input ConnectionInputs SEND HEADERS File usr local lib python3 11 site packages h2 connection py line 228 in process input raise ProtocolError h2 exceptions ProtocolError Invalid input ConnectionInputs SEND HEADERS in state ConnectionState CLOSED During handling of the above exception another exception occurred Traceback most recent call last File usr local lib python3 11 site packages httpx transports default py line 60 in map httpcore exceptions yield File usr local lib python3 11 site packages httpx transports default py line 353 in handle async request resp = await self pool handle async request req ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File usr local lib python3 11 site packages httpcore async connection pool py line 253 in handle async request raise exc File usr local lib python3 11 site packages httpcore async connection pool py line 237 in handle async request response = await connection handle async request request ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File usr local lib python3 11 site packages httpcore async connection py line 90 in handle async request return await self connection handle async request request ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File usr local lib python3 11 site packages httpcore async http2 py line 152 in handle async request raise LocalProtocolError exc pragma nocover ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ httpcore LocalProtocolError Invalid input ConnectionInputs SEND HEADERS in state ConnectionState CLOSED The above exception was the direct cause of the following exception httpx LocalProtocolError Invalid input ConnectionInputs SEND HEADERS in state ConnectionState CLOSED```

Stephen Lloyd · Answer

< Emil Christensen> Do you know what might be causing this

Emil Christensen · Answer

Hey < Stephen Lloyd> wave you can read all about it The TL DR is basically to disable it by setting `PREFECT API ENABLE HTTP2=false` HTTP2 is more efficient but there are some bugs in the upstream libraries that have to get fixed

Stephen Lloyd · Answer

cc < Susan Joshi>

Stephen Lloyd · Answer

Thanks < Emil Christensen> I ll do a better job looking for issues next time