int nghttp2_submit_trailer(nghttp2_session *session, int32_t stream_id, const nghttp2_nv *nva, size_t nvlen)
Submits trailer fields HEADERS against the stream stream_id.
The nva is an array of name/value pair
nghttp2_nvwith nvlen elements. The application must not include pseudo-header fields (headers whose names starts with ":") in nva.
This function creates copies of all name/value pairs in nva. It also lower-cases all names in nva. The order of elements in nva is preserved. For header fields with
nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUEare set, header field name and value are not copied respectively. With
nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME, application is responsible to pass header field name in lowercase. The application should maintain the references to them until
For server, trailer fields must follow response HEADERS or response DATA without END_STREAM flat set. The library does not enforce this requirement, and applications should do this for themselves. If
nghttp2_submit_trailer()is called before any response HEADERS submission (usually by
nghttp2_submit_response()), the content of nva will be sent as response headers, which will result in error.
To submit trailer fields after
nghttp2_submit_response()is called, the application has to specify
nghttp2_submit_response(). Inside of
nghttp2_data_source_read_callback, when setting
nghttp2_data_flag.NGHTTP2_DATA_FLAG_EOF, also set
nghttp2_data_flag.NGHTTP2_DATA_FLAG_NO_END_STREAM. After that, the application can send trailer fields using
nghttp2_submit_trailer()can be used inside
This function returns 0 if it succeeds and stream_id is -1. Otherwise, this function returns 0 if it succeeds, or one of the following negative error codes: