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

Perform the WebSocket handshake asynchronously in the server role.

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

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 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.





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


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.

See Also