span class="special">::</span><span class="identifier">future</span></code> stackful/stackless coroutines,
                    or user defined customizations.
                  </p>
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                            <p>
                              <a href="https://github.com/vinniefalco/Beast/blob/6c8b4b2f8dde72b01507e4ac7fde4ffea57ebc99/include/beast/websocket/impl/stream.ipp#L378" target="_top">Beast</a>
     