TFigueiro at au
Mar 12, 2012, 3:21 PM
Post #3 of 3
Hi, Jonathan. Thanks for the feedback!
RE: Using varnish to increase the cache time of slow pages
[In reply to]
> However, I have a couple of quibbles with this *implementation*:
> 1) Every bit of logic you embed into VCL is something you have to work at
It's fair to note that other web framework engines seem to use the X-Runtime header for this purpose.
But yes, I agree, you might have to implement that in your backend.
> munging the TTL in VCL!), fixing your back-end's code so it outputs the
> right caching headers, possibly using the same methodology, is a more
> significant win. IMHO :-)
Ah! No need to put salt in our sores. :)
What typically happens is that new features are prioritised over improving performance. I think this is a sad reality in many companies.
What little effort goes into performance ends-up being "spread" across the application. If you have editors complaining about content freshness you can now target these specific pages.
> 2) From a more concrete PoV, I'm not sure this code copes well with
> content the back-end explicitly marks as non-cachable (i.e. ttl=0).
We have specific code in our VCL for this and assumed everyone else does. I should have mentioned that when this excerpt runs we have already 'passed' content which is not cacheable.
> Anyway, thanks for introducing the concept! Sorry if this looks a bit
> negative - it's not really meant to come over as such :-)
Not negative at all, they were all good points and I appreciate you taking the time to ping back.
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