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Send an HTTP WebSocket Upgrade request and receive the response.
void handshake( string_view host, string_view target);
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 name of the remote host, required by the HTTP protocol. | 
| 
                       | The Request Target, which may not be empty, required by the HTTP protocol. | 
| Type | Thrown On | 
|---|---|
| 
                       | Thrown on failure. | 
websocket::stream<ip::tcp::socket> ws{io_context}; ... try { ws.handshake("localhost", "/"); } catch(...) { // An error occurred. }