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https://issues.apache.org/jira/browse/SOLR-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566951#action_12566951
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Thomas Peuss commented on SOLR-127:
-----------------------------------
Think of two scenarios:
* An AJAXified browser client sending requests to Solr. Caching of unchanged
data in the client and corporate caching proxies speeds up things.
* A cluster of Solr servers behind a loadbalancer with caching functionality.
Middleware sends requests to Solr through the loadbalancer. Repeating requests
to unchanged data are responded directly from LB cache without putting load to
the Solr servers. This is for example our scenario.
Our code works fine with BlueCoat Webcache, Apache HTTPD proxy cache, Squid
proxy cache and many other solutions _because_ we are following standards here.
So I don't really get the point of your comment.
Besides that you can completely disable this HTTP header stuff in
solrconfig.xml if you don't want it.
> 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
> Assignee: Hoss Man
> Fix For: 1.3
>
> Attachments: CacheUnitTest.patch, CacheUnitTest.patch,
> HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch,
> HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch,
> HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch, HTTPCaching.patch,
> 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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