fixup indentation (spaces), restore use stale

2.Common_services/5.Nginx/vhost_cache.conf

 proxy_cache_path /tmp/nginx-uc-cache levels=1:2 keys_zone=uc-cache:10m max_size=10g inactive=300s;
 
 server {
-	listen 80 default_server;
-	listen 443 default_server ssl;
-	server_name {{ server_name }};
+    listen 80 default_server;
+    listen 443 default_server ssl;
+    server_name {{ server_name }};
 
-	root /var/www/cache/;
+    root /var/www/cache/;
 
-	access_log /var/log/nginx/access_cache.log;
-	error_log /var/log/nginx/error_cache.log;
+    access_log /var/log/nginx/access_cache.log;
+    error_log /var/log/nginx/error_cache.log;
 
-	location /crossdomain {
-	}
+    location /crossdomain {
+    }
 
-	location /streaming/ {
-		# Live
-		location ~ \.m3u8$ {
-			rewrite ^/(.*)$ /$1? break;
-			proxy_pass {{ source_server }};
-			proxy_cache uc-cache;
-			# do not consider secure urls as new files
-			proxy_cache_key $scheme$proxy_host$uri;
-			# only one request at a time will be allowed to populate a new cache element 
-			proxy_cache_lock on;
-			# ignore upstream headers
+    location /streaming/ {
+        # Live
+        location ~ \.m3u8$ {
+            rewrite ^/(.*)$ /$1? break;
+            proxy_pass {{ source_server }};
+            proxy_cache uc-cache;
+            # do not consider secure urls as new files
+            proxy_cache_key $scheme$proxy_host$uri;
+            # only one request at a time will be allowed to populate a new cache element 
+            proxy_cache_lock on;
+            # serve from cache while updating
+            proxy_cache_use_stale updating;
+            # ignore upstream headers
             # http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_valid
-			proxy_ignore_headers Cache-Control;
-			proxy_ignore_headers X-Accel-Expires;
-			proxy_ignore_headers Expires;
+            proxy_ignore_headers "Cache-Control" "X-Accel-Expires" "Expires";
             # hide upstream X-Cache header
-			proxy_hide_header X-Cache;
+            proxy_hide_header X-Cache;
             # add own X-Cache header
-			add_header X-Cache $upstream_cache_status;
+            add_header X-Cache $upstream_cache_status;
 
             # m3u8-specific
-			# how long should the data be kept in this cache
-			proxy_cache_valid 200 2s;
-			# instruct browsers never to cache m3u8
-			expires -1;
-		}
-		location ~ \.ts$ {
-			rewrite ^/(.*)$ /$1? break;
-			proxy_pass {{ source_server }};
-			proxy_cache uc-cache;
-			# do not consider secure urls as new files
-			proxy_cache_key $scheme$proxy_host$uri;
-			# only one request at a time will be allowed to populate a new cache element 
-			proxy_cache_lock on;
-			# ignore upstream headers
+            # how long should the data be kept in this cache
+            proxy_cache_valid 200 2s;
+            # instruct browsers never to cache m3u8 max 1s
+            expires 1s;
+        }
+        location ~ \.ts$ {
+            rewrite ^/(.*)$ /$1? break;
+            proxy_pass {{ source_server }};
+            proxy_cache uc-cache;
+            # do not consider secure urls as new files
+            proxy_cache_key $scheme$proxy_host$uri;
+            # only one request at a time will be allowed to populate a new cache element 
+            proxy_cache_lock on;
+            # serve from cache while updating 
+            proxy_cache_use_stale updating;
+            # ignore upstream headers
             # http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_valid
-			proxy_ignore_headers Cache-Control;
-			proxy_ignore_headers X-Accel-Expires;
-			proxy_ignore_headers Expires;
+            proxy_ignore_headers Cache-Control;
+            proxy_ignore_headers X-Accel-Expires;
+            proxy_ignore_headers Expires;
             # hide upstream X-Cache header
-			proxy_hide_header X-Cache;
+            proxy_hide_header X-Cache;
             # add own X-Cache header
-			add_header X-Cache $upstream_cache_status;
+            add_header X-Cache $upstream_cache_status;
 
             # ts-specific
-			# how long should the data be kept in this cache
-			proxy_cache_valid 200 10s;
-			# instruct browsers to cache this for 6s
-			expires 6s;
-		}
-	}
-	location /resources/ {
-		# VOD
-		location ~ \.(m3u8|ts|mp4|mp3|oga|ogv|ogg|mov|flv)$ {
-			rewrite ^/(.*)$ /$1? break;
-			proxy_pass {{ source_server }};
-			proxy_cache uc-cache;
-			# do not consider secure urls as new files
-			proxy_cache_key $scheme$proxy_host$uri;
-			# only one request at a time will be allowed to populate a new cache element 
-			proxy_cache_lock on;
-			proxy_cache_min_uses 1;
-			proxy_cache_use_stale updating;
-			# how long should the data be kept in the cache
-			proxy_cache_valid 200 7d;
-			# instruct browser to cache this
-			expires 7d;
-			# headers
-			proxy_ignore_headers Cache-Control;
-			proxy_ignore_headers Set-Cookie;
-			proxy_ignore_headers X-Accel-Expires;
-			proxy_ignore_headers Expires;
-			add_header X-Cache $upstream_cache_status;
-		}
-	}
-	location / {
-		# only urls to video and audio files are allowed, discard any requested path for other urls
-		rewrite ^/(.*)$ /index.html? break;
-	}
+            # how long should the data be kept in this cache
+            proxy_cache_valid 200 10s;
+            # instruct browsers to cache this for 6s
+            expires 6s;
+        }
+    }
+    location /resources/ {
+        # VOD
+        location ~ \.(m3u8|ts|mp4|mp3|oga|ogv|ogg|mov|flv)$ {
+            rewrite ^/(.*)$ /$1? break;
+            proxy_pass {{ source_server }};
+            proxy_cache uc-cache;
+            # do not consider secure urls as new files
+            proxy_cache_key $scheme$proxy_host$uri;
+            # only one request at a time will be allowed to populate a new cache element
+            proxy_cache_lock on;
+            proxy_cache_min_uses 1;
+            proxy_cache_use_stale updating;
+            # how long should the data be kept in the cache
+            proxy_cache_valid 200 7d;
+            # instruct browser to cache this
+            expires 7d;
+            # headers
+            proxy_ignore_headers Cache-Control;
+            proxy_ignore_headers Set-Cookie;
+            proxy_ignore_headers X-Accel-Expires;
+            proxy_ignore_headers Expires;
+            add_header X-Cache $upstream_cache_status;
+        }
+    }
+    location / {
+        # only urls to video and audio files are allowed, discard any requested path for other urls
+        rewrite ^/(.*)$ /index.html? break;
+    }
 }