>async_write</span></code> the completion
                    handler is called once when the data finishes sending, in a manner
                    identical to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span></code>.
                  </p>
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