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nghttp2_submit_ping
===================
Synopsis
--------
*#include <nghttp2/nghttp2.h>*
.. function:: int nghttp2_submit_ping(nghttp2_session *session, uint8_t flags, const uint8_t *opaque_data)
Submits PING frame. You don't have to send PING back when you
received PING frame. The library automatically submits PING frame
in this case.
The *flags* is bitwise OR of 0 or more of the following value.
* :enum:`nghttp2_flag.NGHTTP2_FLAG_ACK`
Unless `nghttp2_option_set_no_auto_ping_ack()` is used, the *flags*
should be :enum:`nghttp2_flag.NGHTTP2_FLAG_NONE`.
If the *opaque_data* is non ``NULL``, then it should point to the 8
bytes array of memory to specify opaque data to send with PING
frame. If the *opaque_data* is ``NULL``, zero-cleared 8 bytes will
be sent as opaque data.
This function returns 0 if it succeeds, or one of the following
negative error codes:
:enum:`nghttp2_error.NGHTTP2_ERR_NOMEM`
Out of memory.
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