disable m3u8 expiration

2.Common_services/5.Nginx/vhost_cache.conf

@@ -36,8 +36,8 @@ server {
             # m3u8-specific
             # how long should the data be kept in this cache
             proxy_cache_valid 200 2s;
-            # instruct browsers never to cache m3u8 max 1s
-            expires 1s;
+            # instruct browsers never to cache m3u8
+            expires -1;
         }
         location ~ \.ts$ {
             rewrite ^/(.*)$ /$1? break;