Avoid failing HTTP/2 requests with upgrade-insecure-requests
#12799
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Motivation:
This is a non-standard header that is not explicitly called out as connection related, even though it can be argued that it is. Regardless, Chrome and Firefox do actually send this header in their HTTP/2 requests, so rejecting these is quite troublesome. Safari doesn't send this header.
Modification:
Remove the check for
upgrade-insecure-requests
in the header validation in HpackDecoder. Also update tests to match.Result:
HTTP/2 requests from Chrome and Firefox are no longer rejected by the header validation.
Fixes #12798