nghttp2_conn_submit_ping
========================

Synopsis
--------

*#include <nghttp2v2/nghttp2.h>*

.. function:: int nghttp2_conn_submit_ping(nghttp2_conn *conn, const nghttp2_ping_data *data)

    
    `nghttp2_conn_submit_ping` submits PING frame with the given
    *data*.  *data* must point to the buffer that contains at least 8
    bytes of data.  At most 1 PING is allowed in flight.  When PING
    frame with ACK flag is set is received from the remote endpoint,
    :type:`nghttp2_recv_ping_ack` callback is called.
    
    :macro:`NGHTTP2_ERR_INVALID_STATE`
        Another PING is already in-flight.