websocket::stream::async_accept (3 of 3 overloads)

Perform the WebSocket handshake asynchronously in the server role.

Synopsis

template<
    class Body,
    class Allocator,
    class AcceptHandler>
DEDUCED
async_accept(
    http::request< Body, http::basic_fields< Allocator >> const& req,
    AcceptHandler&& handler);

Description

This initiating function is used to asynchronously begin performing the WebSocket handshake, required before messages can be sent and received. During the handshake, the client sends the Websocket Upgrade HTTP request, and the server replies with an HTTP response indicating the result of the handshake. This call always returns immediately. The asynchronous operation will continue until one of the following conditions is true:

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

The algorithm, known as a composed asynchronous operation, is implemented in terms of calls to the next layer's async_read_some and async_write_some functions. No other operation may be performed on the stream until this operation completes. If a valid upgrade request is received, an HTTP response with a status-code of http::switching_protocols is sent to the peer, otherwise a non-successful error is associated with the operation.

Parameters

Name	Description
`req`	An object containing the HTTP Upgrade request. Ownership is not transferred, the implementation will not access this object from other threads.
`handler`	The completion handler to invoke when the operation completes. The implementation takes ownership of the handler by performing a decay-copy. The equivalent function signature of the handler must be: void handler( error_code const& ec // Result of operation ); Regardless of whether the asynchronous operation completes immediately or not, the handler will not be invoked from within this function. Invocation of the handler will be performed in a manner equivalent to using `net::post`.

Name

Description

req

An object containing the HTTP Upgrade request. Ownership is not transferred, the implementation will not access this object from other threads.

handler

The completion handler to invoke when the operation completes. The implementation takes ownership of the handler by performing a decay-copy. The equivalent function signature of the handler must be:

void handler(
    error_code const& ec    // Result of operation
);

Regardless of whether the asynchronous operation completes immediately or not, the handler will not be invoked from within this function. Invocation of the handler will be performed in a manner equivalent to using net::post.

Boost C++ Libraries

websocket::stream::async_accept (3 of 3 overloads)