Function create_handshake_request 

pub fn create_handshake_request(
    request: RequestBuilder,
    http_state: Arc<HttpState>,
) -> Result<Request, Error>

Create a Request object for the initial HTTP request. This request contains Origin, Sec-WebSocket-Protocol, Authorization, and Cookie headers as appropriate. Returns an error if any header values are invalid or tungstenite cannot create the desired request.