Varnish is running, Magento is skyrocketing until we noticed that
currency change doesn't work.
OF course it doesn't because url is same when you switch currency.
Is there a workaround solution for this?
Currency exchange url is: /directory/currency/switch/currency/EUR/uenc/xxxsomethingyyy/
Varnish config;
backend default { .host = "127.0.0.1"; .port = "8000"; } acl trusted { "127.0.0.1"; "127.0.1.1"; } sub vcl_recv { if (req.http.x-forwarded-for) { set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip; } else { set req.http.X-Forwarded-For = client.ip; } if (req.request == "PURGE") { # Allow requests from trusted IPs to purge the cache if (!client.ip ~ trusted) { error 405 "Not allowed."; } ban("req.url ~ " + req.url); error 200 "Ok"; #We don't go to backend } if (req.request != "GET" && req.request != "HEAD" && req.request != "PUT" && req.request != "POST" && req.request != "TRACE" && req.request != "OPTIONS" && req.request != "DELETE") { /* Non-RFC2616 or CONNECT which is weird. */ return (pipe); } # Cache only GET or HEAD requests if (req.request != "GET" && req.request != "HEAD") { /* We only deal with GET and HEAD by default */ return (pass); } # parse accept encoding rulesets to normalize if (req.http.Accept-Encoding) { if (req.http.Accept-Encoding ~ "gzip") { set req.http.Accept-Encoding = "gzip"; } elsif (req.http.Accept-Encoding ~ "deflate") { set req.http.Accept-Encoding = "deflate"; } else { remove req.http.Accept-Encoding; } } # Rules for static files if (req.url ~ "\.(jpeg|jpg|png|gif|ico|swf|js|css|gz|rar|txt|bzip|pdf)(\?.*|)$") { set req.http.staticmarker = "1"; unset req.http.Cookie; return (lookup); } # Don't cache pages for Magento Admin # FIXME: change this rule if you use custom url in admin if (req.url ~ "^/(index.php/)?admin") { return(pass); } # Don't cache checkout/customer pages, product compare if (req.url ~ "^/(index.php/)?(checkout|customer|catalog/product_compare|wishlist)") { return(pass); } # Don't cache checkout/customer pages, product compare, custom urls, & WP if (req.url ~ "/(checkout|customer|catalog/product_compare|wishlist|paywayr|directory)/") { return(pass); } # Don't cache till session end if (req.http.cookie ~ "nocache_stable") { return(pass); } # Unique identifier witch tell Varnish use cache or not if (req.http.cookie ~ "nocache") { return(pass); } # Remove cookie unset req.http.Cookie; set req.http.magicmarker = "1"; #Instruct varnish to remove cache headers received from backend return(lookup); } sub vcl_pipe { return (pipe); } # Called after a cache lookup if the req. document was found in the cache. sub vcl_hit { if (req.request == "PURGE") { ban_url(req.url); error 200 "Purged"; } return (deliver); } # Called after a cache lookup and odc was not found in cache. sub vcl_miss { if (req.request == "PURGE"){ error 200 "Not in cache"; } return (fetch); } # Called after document was retreived from backend sub vcl_fetch { set req.grace = 30s; # Current response should not be cached if(beresp.http.Set-Cookie ~ "nocache=1") { return (deliver); } # Flag set when we want to delete cache headers received from backend if (req.http.magicmarker){ unset beresp.http.magicmarker; unset beresp.http.Cache-Control; unset beresp.http.Expires; unset beresp.http.Pragma; unset beresp.http.Cache; unset beresp.http.Server; unset beresp.http.Set-Cookie; unset beresp.http.Age; # default ttl for pages set beresp.ttl = 1d; } if (req.http.staticmarker) { set beresp.ttl = 30d; # static file cache expires in 30 days unset beresp.http.staticmarker; unset beresp.http.ETag; # Removes Etag in case we have multiple frontends } return (deliver); } # Called after a cached document is delivered to the client. sub vcl_deliver { if (obj.hits > 0) { set resp.http.X-Cache = "HIT ("+obj.hits+")"; } else { set resp.http.X-Cache = "MISS"; # set resp.http.X-Cache-Hash = obj.http.hash; } return (deliver); }
Best Answer
As the currency is stored in a cookie parameter, one solution is to add that value into the hash for the varnish lookup.
Example is taken from this this link, and slightly modified. Untested.
Also Varnish docs on the subject on caching on cookies: Caching, even when cookies are present, link, look for the link as well in, couldn't post third link since not enough rep yet.