public static IHubConnectionBuilder WithUrl(this IHubConnectionBuilder hubConnectionBuilder, Uri url) { if (url == null) { throw new ArgumentNullException(nameof(url)); } hubConnectionBuilder.ConfigureConnectionFactory(() => { var headers = hubConnectionBuilder.GetHeaders(); var httpOptions = new HttpOptions { HttpMessageHandler = hubConnectionBuilder.GetMessageHandler(), Headers = headers != null ? new ReadOnlyDictionary <string, string>(headers) : null, AccessTokenFactory = hubConnectionBuilder.GetAccessTokenFactory(), WebSocketOptions = hubConnectionBuilder.GetWebSocketOptions(), }; return(new HttpConnection(url, hubConnectionBuilder.GetTransport(), hubConnectionBuilder.GetLoggerFactory(), httpOptions)); }); return(hubConnectionBuilder); }