nghttp2: updated to 1.49.0

Nghttp2 v1.49.0

lib

This release adds nghttp2_check_header_value_rfc9113 which complains leading and trailing white spaces. The library now uses this function instead of nghttp2_check_header_value when checking HTTP header fields.

asio

libnghttp2_asio has been moved to its own repository and got new maintainer. libnghttp2_asio related code in nghttp2 repository will not get any updates and be removed at the end of 2022.

python

Python bindings have been deprecated, and will not get any updates and be removed at the end of 2022 due to the maintenance issues.

nghttpx

Randomizing backend server selection has been added again.

The broken PROXY-protocol when TLS is used has been fixed.

nghttpx now removes trailing white spaces from HTTP header fields to align with RFC 9113.

(adam)