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Send an HTTP WebSocket Upgrade request and receive the response.
void handshake( response_type& res, string_view host, string_view target, error_code& ec);
This function is used to synchronously send the WebSocket upgrade HTTP request. The call blocks until one of the following conditions is true:
            This function is implemented in terms of one or more calls to the next
            layer's read_some and
            write_some functions.
          
The operation is successful if the received HTTP response indicates a successful HTTP Upgrade (represented by a Status-Code of 101, "switching protocols").
| Name | Description | 
|---|---|
| 
                       | 
                      The HTTP Upgrade response returned by the remote endpoint.
                      If  | 
| 
                       | The name of the remote host, required by the HTTP protocol. | 
| 
                       | The Request Target, which may not be empty, required by the HTTP protocol. | 
| 
                       | Set to indicate what error occurred, if any. | 
websocket::stream<ip::tcp::socket> ws{io_context}; ... error_code ec; response_type res; ws.handshake(res, host, target, ec); if(ec) { // An error occurred. }