Merge pull request #3685 from video-dev/bugfix/ll-hls-cdn-tune-in-low…

…-latency-mode

Disable "age" header check with lowLatencyMode

src/loader/playlist-loader.ts

@@ -70,8 +70,6 @@ class PlaylistLoader {
     [key: string]: Loader<LoaderContext>;
   } = Object.create(null);
 
-  private checkAgeHeader: boolean = true;
-
   constructor(hls: Hls) {
     this.hls = hls;
     this.registerListeners();
@@ -148,7 +146,6 @@ class PlaylistLoader {
     data: ManifestLoadingData
   ) {
     const { url } = data;
-    this.checkAgeHeader = true;
     this.load({
       id: null,
       groupId: null,
@@ -686,13 +683,10 @@ class PlaylistLoader {
       return;
     }
 
-    // Avoid repeated browser error log `Refused to get unsafe header "age"` when unnecessary or past attempts failed
-    const checkAgeHeader = this.checkAgeHeader && levelDetails.live;
-    const ageHeader: string | null = checkAgeHeader
-      ? loader.getResponseHeader('age')
-      : null;
-    levelDetails.ageHeader = ageHeader ? parseFloat(ageHeader) : 0;
-    this.checkAgeHeader = !!ageHeader;
+    if (levelDetails.live) {
+      const ageHeader = loader.getResponseHeader('age');
+      levelDetails.ageHeader = ageHeader ? parseFloat(ageHeader) : 0;
+    }
 
     switch (type) {
       case PlaylistContextType.MANIFEST:

src/utils/xhr-loader.ts

@@ -250,12 +250,8 @@ class XhrLoader implements Loader<LoaderContext> {
   }
 
   getResponseHeader(name: string): string | null {
-    if (this.loader) {
-      try {
-        return this.loader.getResponseHeader(name);
-      } catch (error) {
-        /* Could not get headers */
-      }
+    if (this.loader && this.loader.getAllResponseHeaders().indexOf(name) >= 0) {
+      return this.loader.getResponseHeader(name);
     }
     return null;
   }