general: allow video/iso and re-validate CORS when vary origin

Author: iparamonau

config.js

@@ -80,6 +80,7 @@
             video_mp4: "video/mp4",
             video_ogg: "video/ogg",
             video_webm: "video/webm",
+            video_iso: "video/iso.segment",
             stream_apple_mpegurl: "application/vnd.apple.mpegurl",
             stream_x_mpegurl: "application/x-mpegURL",
             audio_mp3: "audio/mp3",

lib/utils.js

@@ -798,7 +798,7 @@ export function getContentType(uriForCache, uriOriginal, options, cb) {
                             || error >= 500
                             // Or ClourFront that gobbles up headers when checking CORS.
                             || (res.headers && !res.headers['access-control-allow-origin']
-                                && res.headers['server'] === 'AmazonS3' && !error ))) {
+                                && (res.headers['server'] === 'AmazonS3' || /origin/i.test(res.headers['vary'])) && !error ))) {
                         makeCall(uriOriginal, 'GET');
                         return;
                     }