Fix CORS on TS Client (#1652)

client-ts/signalr/src/HttpClient.ts

@@ -54,6 +54,7 @@ export class DefaultHttpClient extends HttpClient {
             const xhr = new XMLHttpRequest();
 
             xhr.open(request.method, request.url, true);
+            xhr.withCredentials = true;
             xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 
             if (request.headers) {

client-ts/signalr/src/Transports.ts

@@ -145,7 +145,7 @@ export class ServerSentEventsTransport implements ITransport {
                 url += (url.indexOf("?") < 0 ? "?" : "&") + `access_token=${encodeURIComponent(token)}`;
             }
 
-            const eventSource = new EventSource(url);
+            const eventSource = new EventSource(url, { withCredentials: true });
 
             try {
                 eventSource.onmessage = (e: MessageEvent) => {

samples/SocketsSample/Startup.cs

@@ -38,7 +38,8 @@ namespace SocketsSample
                 {
                     p.AllowAnyHeader()
                      .AllowAnyMethod()
-                     .AllowAnyOrigin();
+                     .AllowAnyOrigin()
+                     .AllowCredentials();
                 });
             });