HTTP/2 C library and tools

Nghttp2 v1.31.0

We have released nghttp2 v1.31.0.


nghttp2_session_set_user_data() is added to set new user data to nghttp2_session.


The option --verify-client-tolerate-expired has been added, which makes nghttpx accept expired client certificate.

tls_client_not_before, and tls_client_not_after are now available to mruby scripting. They return NotBefore, and NotAfter of client certificate respectively.