Function async_tungstenite::accept_hdr_async

pub async fn accept_hdr_async<S, C>(
    stream: S, 
    callback: C
) -> Result<WebSocketStream<S>, WsError> where
    S: AsyncRead + AsyncWrite + Unpin,
    C: Callback + Unpin, 

Accepts a new WebSocket connection with the provided stream.

This function does the same as accept_async() but accepts an extra callback for header processing. The callback receives headers of the incoming requests and is able to add extra headers to the reply.