websocket::stream::handshake (2 of 4 overloads)

Send an HTTP WebSocket Upgrade request and receive the response.

Synopsis

void
handshake(
    response_type& res,
    string_view host,
    string_view target);

Description

This function is used to synchronously send the WebSocket upgrade HTTP request. The call blocks until one of the following conditions is true:

The request is sent and the response is received.
An error occurs on the stream

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").

Parameters

Name	Description
`res`	The HTTP Upgrade response returned by the remote endpoint.
`host`	The name of the remote host, required by the HTTP protocol.
`target`	The Request Target, which may not be empty, required by the HTTP protocol.

Exceptions

Type	Thrown On
`system_error`	Thrown on failure.

Example

websocket::stream<ip::tcp::socket> ws{io_context};
...
try
{
    response_type res;
    ws.handshake(res, "localhost", "/");
}
catch(...)
{
    // An error occurred.
}

Boost C++ Libraries

websocket::stream::handshake (2 of 4 overloads)