Using varnish cookies to set up a/b test
sub vcl_recv { if (req.http.host == "www.domain.tld" && req.url ~ "^/pagename" && ! req.http.Cookie ~ "abtestpagename") { if (std.random(1, 100)>50) { set req.http.Cookie = "abtestpagename=newversion; Max-Age=xxxx; Path=/"; } else { set req.http.Cookie = "abtestpagename=original; Max-Age=xxx; Path=/"; } set req.http.X-Cookie-ab-test-pagename = req.http.Cookie; } if (req.http.host == "www.domain.tld" && req.url ~ "^/pagename" && req.http.Cookie ~ "abtestpagename=newversion") { set req.url = "/newpagename/"; } //Other stuff that may include cookie cleanup for cache hit rate increase } sub vcl_deliver { if (req.http.X-Cookie-ab-test-pagename) { set resp.http.Set-Cookie = req.http.X-Cookie-ab-test-pagename; } }
