fix: LSDV-4593: CORS error requesting audio (#1234)

* fix: LSDV-4593: CORS error requesting audio

* use a less likely query param, ensure all relative urls are handled so 404 errors are thrown correctly

Author: bmartel

src/lib/AudioUltra/Media/MediaLoader.ts

@@ -185,7 +185,15 @@ export class MediaLoader extends Destructable {
         }
       });
 
-      xhr.open('GET', url, true);
+      // Handle relative urls, by converting them to absolute so any query params can be preserved
+      const newUrl = new URL(url, /^https?/.exec(url) ? undefined : window.location.href);
+
+      // Arbitrary setting of query param to stop caching from reusing any media requests which may have less headers
+      // cached than this request. This is to prevent a CORS error when the headers are different between partial
+      // content and full content requests.
+      newUrl.searchParams.set('lsref', '1');
+
+      xhr.open('GET', newUrl.toString(), true);
       xhr.send();
     });
   }