int nghttp2_check_path(const uint8_t *value, size_t len)
Returns nonzero if the value which is supposed to be the value of the :path header field is valid according to https://datatracker.ietf.org/doc/html/rfc7540#section-22.214.171.124
value is valid if it merely consists of the allowed characters. In particular, it does not check whether value follows the syntax of path. The allowed characters are all characters valid by
nghttp2_check_header_value()minus SPC and HT.