2 nghttp2_submit_extension
3 ========================
8 *#include <nghttp2/nghttp2.h>*
10 .. function:: int nghttp2_submit_extension(nghttp2_session *session, uint8_t type, uint8_t flags, int32_t stream_id, void *payload)
13 Submits extension frame.
15 Application can pass arbitrary frame flags and stream ID in *flags*
16 and *stream_id* respectively. The *payload* is opaque pointer, and
17 it can be accessible though ``frame->ext.payload`` in
18 :type:`nghttp2_pack_extension_callback`. The library will not own
19 passed *payload* pointer.
21 The application must set :type:`nghttp2_pack_extension_callback`
22 using `nghttp2_session_callbacks_set_pack_extension_callback()`.
24 The application should retain the memory pointed by *payload* until
25 the transmission of extension frame is done (which is indicated by
26 :type:`nghttp2_on_frame_send_callback`), or transmission fails
27 (which is indicated by :type:`nghttp2_on_frame_not_send_callback`).
28 If application does not touch this memory region after packing it
29 into a wire format, application can free it inside
30 :type:`nghttp2_pack_extension_callback`.
32 The standard HTTP/2 frame cannot be sent with this function, so
33 *type* must be strictly grater than 0x9. Otherwise, this function
34 will fail with error code :macro:`NGHTTP2_ERR_INVALID_ARGUMENT`.
36 This function returns 0 if it succeeds, or one of the following
39 :macro:`NGHTTP2_ERR_INVALID_STATE`
40 If :type:`nghttp2_pack_extension_callback` is not set.
41 :macro:`NGHTTP2_ERR_INVALID_ARGUMENT`
42 If *type* specifies standard HTTP/2 frame type. The frame
43 types in the rage [0x0, 0x9], both inclusive, are standard
44 HTTP/2 frame type, and cannot be sent using this function.
45 :macro:`NGHTTP2_ERR_NOMEM`