Purging on form submit

[Nuno Neves]

Hello,

 I'm running a forum that has a ttl to expire content to guests only, but I would like to opitmize it to purge a page when we have new posts or after 24h (to update counters).

 My 1st question is how can I get the hiden input value I have that tell varnish that we have a new post? 

<input type="hidden" name="canpurge" value="/topic/123-my-topic/" />

 I was thinking of something like this:

 sub vcl_recv {
 if (req.request == "POST" && FORM.FIELD == "canpurge) {
 purge req.http.host == example.com && req.url ~ ^FORM.CANPURGE.VALUE.*$
 }
 }

 This is an excertt of my actual configuration:

 ====================================================================================================

 sub vcl_recv {

 ## == Mobile ==
 if (req.http.User-Agent ~ "(iPad|iPhone|iPod|Android|SymbianOS|^BlackBerry|^SonyEricsson|^Nokia|^SAMSUNG|^LG)") {
 return(pass);
 }

 if (!((req.http.Cookie ~ "member_id=" && req.http.Cookie !~ "member_id=(0|-1)") || req.http.Cookie ~ "(guestSkinChoice|language)")) {
 if (req.url ~ "^/(public|forum|topic|gallery|blogs|members|user|calendar)/") {
 unset req.http.cookie;
 set req.grace = 15s;
 }
 if (req.url == "/" || req.url == "/index.php") {
 unset req.http.cookie;
 set req.grace = 15s;
 }
 }
 }

 sub vcl_fetch {
 if (!((req.http.Cookie ~ "member_id=" && req.http.Cookie !~ "member_id=(0|-1)") || req.http.Cookie ~ "(guestSkinChoice|language)")) {

 ## == INDEX ==

 if (req.url == "/" || req.url == "/index.php") {
 unset beresp.http.set-cookie;
 set beresp.ttl = 300s;
 set beresp.grace = 30s;
 }

 ## == ESI ==

 if (req.url ~ "^/(gallery/image|topic)/") {
 set beresp.do_esi = true;
 unset beresp.http.set-cookie;
 set beresp.ttl = 300s;
 set beresp.grace = 30s;

 ## Others

 } elseif (req.url ~ "^/(public|forum|gallery|blogs|members|user|calendar)/") {
 unset beresp.http.set-cookie;
 set beresp.ttl = 600s;
 set beresp.grace = 30s;
 }
 }
 }

 ====================================================================================================

 Thanks
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