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POVarnish Cache not Caching PHP with Sessions Unless backend TTL altered
 

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  1. POVarnish Cache not Caching PHP with Sessions Unless backend TTL altered
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    <p>I'm new to Varnish Cache and have a question I hope I can get some help with.</p> <p>I have a very simple and basic setup but it's not working as I understand it should for some reason.</p> <p>It's related to Varnish not caching PHP pages that are using cookies.</p> <p>Here is my setup:</p> <p>1) For my default.vcl I have a simple backend</p> <pre><code>backend default { .host = "127.0.0.1"; .port = "80"; } </code></pre> <p>2) I have a simple PHP file that has only these two line:</p> <pre><code>session_start(); echo time(); </code></pre> <p>3) When I call this page it correctly does not cache as I have not added in the required vcl rules</p> <p>4)</p> <p>So as per my understanding of the documentation I add in these two rules</p> <pre><code>sub vcl_recv { unset req.http.Cookie; return (lookup); } sub vcl_fetch { unset beresp.http.Set-Cookie; return(deliver); } </code></pre> <p>5) The PHP page still will not cache. I can see the <code>Set-Cookie</code> header has been removed as I'm using FireBug in FireFox.</p> <p>It's only if I add this to sub vcl_fetch that the PHP will cache:</p> <pre><code>set beresp.ttl = 24h; </code></pre> <p>My question is is this correct?</p> <p>I didn't think I would need to alter the ttl of the backend response. I thought just unsetting cookies in and out would force PHP w/ session to cache.</p> <p>My complete default vcl is:</p> <pre><code>backend default { .host = "127.0.0.1"; .port = "80"; } sub vcl_recv { unset req.http.Cookie; return (lookup); } sub vcl_fetch { unset beresp.http.Set-Cookie; set beresp.ttl = 24h; return(deliver); } </code></pre> <p>My start up command is:</p> <pre><code>varnishd -f /etc/varnish/default.vcl -s malloc,128M -T 127.0.0.1:2000 -a 0.0.0.0:8080 </code></pre> <p>The URL I am calling is:</p> <pre><code>http://vbox.local:8080/varnish-tests/index.php </code></pre> <p>My index.php file has only:</p> <pre><code>&lt;?php session_start(); echo time(); </code></pre> <p>I would like to ask the community if this looks correct or if I am wrong. Essentially I'm just unsure why I had to add the beresp.ttl = 24h to finally have the page cache in varnish.</p> <p>I thought I would not need this.</p> <p>Any advise much appreciated. </p> <p>Thank you!</p> <p>Kind regards.</p>
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    1. COThis matches my experience -- I've set ttls for everything I want varnish to cache in my VCL. How long would you expect varnish to cache something if you don't give it a ttl?
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      1. USFrank Farmer
    2. COHey Frank. Your comment makes perfect sense. I was just unsure as I didn't notice anything in the docs about setting the beresp.ttl related to caching cookies. Maybe I mist that in the docs. I spent over 30mins scratching my head until I 'figured' it out. Thanks again.
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    3. COSomething to watch for when caching PHP responses that deal with sessions: PHP will *by default* [send anti-caching headers](http://us2.php.net/manual/en/function.session-cache-limiter.php). If Varnish is obeying these headers, you may have difficulties down the line if you're expecting specific caching behavior (once you solve your current problem, which is entirely unrelated).
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