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###### websocket::stream::pong (2 of 2 overloads)

Send a websocket pong control frame.

<h7> Synopsis </h7>

    void
    pong(
        ping_data const& payload,
        error_code& ec);

<h7> Description </h7>

This function is used to send a pong frame, which is usually sent automatically in response to a ping frame from the remote peer. The call blocks until one of the following conditions is true:

- The pong frame is written.
- An error occurs.

The algorithm, known as a composed operation, is implemented in terms of calls to the next layer's `write_some` function. WebSocket allows pong frames to be sent at any time, without first receiving a ping. An unsolicited pong sent in this fashion may indicate to the remote peer that the connection is still active.

<h7> Parameters </h7>

Name | Description
--- | ---
`payload` | The payload of the pong message, which may be empty.
`ec` | Set to indicate what error occurred, if any.