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https://issues.apache.org/jira/browse/SOLR-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535856
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Thomas Peuss commented on SOLR-127:
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What do you expect as default behaviour of this patch?

* Emit no cache related headers at all
* Emit conservative cache related headers
** for example _max-age=0, must-revalidate_ - this should work with every not 
completely broken cache implementation without breaking anything (besides  
pushing performance because you offload the Solr-server)
* Emit more "cachy" headers
** for example _max-age=600_

> Make Solr more friendly to external HTTP caches
> -----------------------------------------------
>
>                 Key: SOLR-127
>                 URL: https://issues.apache.org/jira/browse/SOLR-127
>             Project: Solr
>          Issue Type: Wish
>            Reporter: Hoss Man
>             Fix For: 1.3
>
>         Attachments: HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, 
> HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, 
> HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch
>
>
> an offhand comment I saw recently reminded me of something that really bugged 
> me about the serach solution i used *before* Solr -- it didn't play nicely 
> with HTTP caches that might be sitting in front of it.
> at the moment, Solr doesn't put in particularly usefull info in the HTTP 
> Response headers to aid in caching (ie: Last-Modified), responds to all HEAD 
> requests with a 400, and doesn't do anything special with If-Modified-Since.
> t the very least, we can set a Last-Modified based on when the current 
> IndexReder was open (if not the Date on the IndexReader) and use the same 
> info to determing how to respond to If-Modified-Since requests.
> (for the record, i think the reason this hasn't occured to me in the 2+ years 
> i've been using Solr, is because with the internal caching, i've yet to need 
> to put a proxy cache in front of Solr)

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