1. vcl 4.0;
2. import std;
3. import directors;
4.  
5. backend mfn1 {
6.     .host = "IP-HIDDEN-1";
7.     .port = "8080";
8. }
9.  
10. backend mfn2 {
11.     .host = "IP-HIDDEN-2";
12.     .port = "8080";
13. }
14.  
15. sub vcl_init {
16.     new ocean = directors.round_robin();
17.     ocean.add_backend(mfn1);
18.     ocean.add_backend(mfn2);
19. }
20.  
21. sub vcl_recv {
22.  
23.     set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(_[_a-z]+|has_js)=[^;]*", "");
24.     set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");
25.     set req.backend_hint = ocean.backend();
26.                    
27.                 if (server.ip == "IP-HIDDEN-1") {
28.         set req.backend_hint = mfn1;
29.     } else {
30.         set req.backend_hint = mfn2;
31.     }
32.  
33.     if(req.url ~ "\.(pdf|woff|eot|svg|ttf|jpeg|jpg|png|gif|ico|swf|js|css|html|htm|xml|php)$") { return (hash); }
34.  
35. }
36.  
37. #sub vcl_backend_response { set beresp.ttl = 15m; set beresp.grace = 1h; }
38.  
39. sub vcl_deliver {
40. }
41.  
42. sub vcl_hash {
43.     hash_data(server.ip);
44.     if (req.http.host) {
45.         hash_data(req.http.host);
46.     }
47.     hash_data(req.url);
48.     if (req.http.Accept-Encoding) {
49.         hash_data(req.http.Accept-Encoding);
50.     }
51.     return (lookup);
52. }