Issue 3764 - Redirect adblockplus(chrome|chrome-experimental|opera)/updates.xml to CWS

modules/downloadserver/files/site.conf

 keepalive_timeout 0;
 root /var/www/downloads;
 
 location /.hg
 {
   internal;
 }
 
 # This redirect is necessary since we accidentally set the wrong
 # update URL in ABP for Android 1.2. It can be removed once we're
 # not seeing anyone requesting this file anymore.
 # Note that this intentionally promotes devbuilds to release builds.
 # Since newer versions should use the new devbuild and release
 # build update URLs requested by libadblockplus, leaving this
 # redirect around won't really hurt.
 location /devbuilds/adblockplusandroid/updates.xml
 {
   rewrite ^ https://adblockplus.org/androidupdates.xml?$query_string redirect;
 }
 
-location ~ (/devbuilds)?/adblockbrowser/updates.xml {
+location ~ ^(/devbuilds)?/adblockbrowser/updates.xml
+{
   fastcgi_pass unix:/tmp/multiplexer-fastcgi.sock;
   include fastcgi_params;
   fastcgi_cache adblockbrowserupdates;
   fastcgi_cache_valid 200 10m;
   fastcgi_cache_key "$request_uri";
 }
 
+location ~ ^/devbuilds/adblockplus(chrome|chrome-experimental|opera)/updates.xml
+{
+  rewrite ^ https://clients2.google.com/service/update2/crx?$query_string redirect;
+}
+
 location /devbuilds
 {
   # This is necessary since ABP for Android revisions 323 to 337 crash when
   # detecting an update. Fortunately, we repeated the revision in addonVersion
   # in these versions for some reason, so we can use that pattern to detect
   # them.
   if ($arg_addonVersion ~ "^1\.2\.1\.3\d\d\.3\d\d$")
   {
     return 200 '{}';
   }
   alias /var/www/devbuilds;
 }