Function start 

pub async fn start<T>(
    req: &HttpRequest,
    target: String,
    stream: T,
) -> Result<HttpResponse, Error>
where
    T: Stream<Item = Result<Bytes, PayloadError>> + 'static,

start a websocket proxy

target should be a URL of the form ws://<host> or wss://<host> see awc::Client::ws for more information req and stream are exactly like the arguments to actix_web_actors::ws::start

#[get("/proxy/{port}")]
async fn proxy(
    req: HttpRequest,
    stream: web::Payload,
    port: web::Path<u16>,
) -> Result<HttpResponse, Error> {
    actix_ws_proxy::start(&req, format!("ws://127.0.0.1:{}", port), stream).await
}