Function oe_rpc_servers::start_ws

pub fn start_ws<M, S, H, T, U, V>(
    addr: &SocketAddr, 
    handler: H, 
    allowed_origins: DomainsValidation<Origin>, 
    allowed_hosts: DomainsValidation<Host>, 
    max_connections: usize, 
    extractor: T, 
    middleware: V, 
    stats: U, 
    max_payload: usize
) -> Result<Server, Error> where
    M: Metadata + Unpin,
    S: Middleware<M>,
    S::Future: Unpin,
    S::CallFuture: Unpin,
    H: Into<MetaIoHandler<M, S>>,
    T: MetaExtractor<M>,
    U: SessionStats,
    V: RequestMiddleware, 

Start WS server and return Server handle.