adbeta credentials

modules/dasBidAdapter.js

@@ -335,14 +335,17 @@ export const spec = {
     const baseUrl = getEndpoint(data.ext.network);
     const fullUrl = `${baseUrl}?data=${encodeURIComponent(jsonData)}`;
 
+    // adbeta needs credentials omitted to avoid CORS issues, especially in Firefox
+    const useCredentials = !(!!data.ext?.adbeta);
+
     // Switch to POST if URL exceeds 8k characters
     if (fullUrl.length > 8192) {
       return {
         method: 'POST',
         url: baseUrl,
         data: jsonData,
         options: {
-          withCredentials: true,
+          withCredentials: useCredentials,
           crossOrigin: true,
           customHeaders: {
             'Content-Type': 'text/plain'
@@ -355,7 +358,7 @@ export const spec = {
       method: 'GET',
       url: fullUrl,
       options: {
-        withCredentials: true,
+        withCredentials: useCredentials,
         crossOrigin: true,
       },
     };

test/spec/modules/dasBidAdapter_spec.js

@@ -265,6 +265,35 @@ describe('dasBidAdapter', function () {
       expect(payload.ext.network).to.equal('network1');
     });
 
+    it('should set withCredentials to false when adbeta flag is present', function () {
+      const bidRequestsWithAdbeta = [{
+        bidId: 'bid123',
+        params: {
+          site: 'site1',
+          area: 'area1',
+          slot: 'slot1',
+          network: 'network1',
+          adbeta: 'l1021885!slot.nativestd',
+          pageContext: {}
+        },
+        mediaTypes: {
+          banner: {
+            sizes: [[300, 250]]
+          }
+        }
+      }];
+
+      const bidderRequestWithAdbeta = {
+        bidderRequestId: 'reqId123',
+        ortb2: {},
+        adbeta: true
+      };
+
+      const request = spec.buildRequests(bidRequestsWithAdbeta, bidderRequestWithAdbeta);
+
+      expect(request.options.withCredentials).to.be.false;
+    });
+
     describe('interpretResponse', function () {
       const serverResponse = {
         body: {