Constant libnghttp2_sys::NGHTTP2_HCAT_HEADERS

pub const NGHTTP2_HCAT_HEADERS: nghttp2_headers_category = 3;

The HEADERS frame which does not apply for the above categories, which is analogous to HEADERS in SPDY. If non-final response (e.g., status 1xx) is used, final response HEADERS frame will be categorized here.