Purging on form submit

Nuno Neves nfn at gmx.com
Wed Jul 6 13:52:26 CEST 2011


 I managed to add an new header:

 x-url: /topic/123-my-topic/

 So I just need to add this bit?

 sub vcl_fetch {
 if (req.request == "POST" && beresp.http.x-url) {
 purge("obj.http.host == example.com && req.url ~ " beresp.http.x-url);

 Note that I need to purge /topic/123-my-topic/ and /topic/123-my-topic/all pages after slash.
 In this case can I use purge("obj.http.host == example.com && req.url ~ " beresp.http.x-url.*$);?


----- Original Message -----
From: Rob S
Sent: 07/06/11 11:25 AM
To: varnish-misc at varnish-cache.org
Subject: Re: Purging on form submit

 On 06/07/2011 10:26, Nuno Neves wrote: 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.*$

 Varnish can't see the body of the response. However, if you're able to change the response, you can just add an HTTP header with this information. Then, in vcl_fetch (which is where the HTTP request is sent to the backend), you can probably add something like:

 sub vcl_fetch {
 if (beresp.http.x-purgepattern) {
 purge("obj.http.host == example.com && req.url ~ " beresp.http.x-purgepattern);

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