[MapServer-users] HTTP/2 Protocol Error MS Demo server

[Just van den Broecke]

Hi,

In the pygeoapi CI on GitHub we experience suddenly an error in the OGR 
Provider that connects via WFS to the MapServer demo server. The problem 
has to do with HTTP/2 on a Ubuntu 20.04 system.

Error is like:
"Failure, Msg: HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR 
(err 1)"

I can trigger the same error with curl on a Ubuntu 20.04 LTS (used by 
the GH CI)

  curl -v  https://demo.mapserver.org/cgi-bin/wfs

* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Connection state changed (MAX_CONCURRENT_STREAMS == 128)!
* http2 error: Invalid HTTP header field was received: frame type: 1, 
stream: 1, name: [upgrade], value: [h2,h2c]
* HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)
* stopped the pause stream!
* Connection #0 to host demo.mapserver.org left intact
curl: (92) HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)


Forcing HTTP 1.1 gets rid of the error:

curl -v  --http1.1 https://demo.mapserver.org/cgi-bin/wfs

So it doesn't seem pygeoapi nor GDAL-related. Looks more like this 
(Apache) problem:
https://serverfault.com/questions/937253/https-doesnt-work-with-safari

Best,

--Just

Just van den Broecke