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814c7e68e0
This commit only affects the library behaviour unless nghttp2_option_set_no_http_messaging() is used. We like strict validation against header field name and value against RFC 7230, but we have already so much web sites and libraries in public internet which do not obey these rules. Simply just terminating stream because of this may break web sites and it is too disruptive. So we decided that we should be conservative here so those header fields containing illegal characters are just ignored. But we are conservative only for regular headers. We are strict for pseudo headers since it is new to HTTP/2 and new implementations should know the rules better.
See README.rst