#4846 - Redirect non-matched requests to new redirects service

modules/web/templates/adblockplus.org.conf.erb

 # XSS and clickjacking prevention headers
 
 set $csp_frame "";
 if ($uri ~ ^/(:?\w\w(_\w\w)?/)?(?:index|firefox|chrome|opera|android|internet-explorer|safari|yandex-browser|maxthon)?$|^/blog/)
 {
   set $csp_frame "; frame-src www.youtube-nocookie.com;";
 }
 add_header Content-Security-Policy "default-src 'self'; img-src * data:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval' $csp_frame";
 add_header X-Frame-Options "sameorigin";
 
@@ skipping 336 matching lines @@
     set $link "contributors";
   }
   if ($arg_link = "whitelist")
   {
     set $link "faq_basics";
     set $anchor "#disable";
   }
 
   if ($link = "")
   {
-    return 404;
+    # If there is no match in the legacy redirects, let the new redirect service handle it:
+    rewrite ^ $scheme://adblockplus.to/$arg_link/legacy redirect;
   }
 
   if (!-f "$document_root/$lang/$link")
   {
     set $lang "!!";
   }
   set $langtest "$arg_lang $lang";
   if ($langtest ~ "^(\w+)-(\w+) !!")
   {
     set $lang "$1_$2";
@@ skipping 61 matching lines @@
 location /403.html
 {
   try_files $uri @proxied;
 }
 location @proxied
 {
   proxy_pass https://server16.adblockplus.org;
   proxy_set_header Host adblockplus.org;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 }