Potential parser issue

[TechnikEmpire]

Whenever trying to load this link:

https://osdn.net/ticket/browse.php?group_id=7035&tid=35740

I get an error on the server side (when parsing server headers) that the parser has flagged the response as an upgrade. Not sure what this is, but the connection fails since we reject upgrade requests. Need to dump these headers and find out exactly what is causing the parser to flag it as an upgrade.