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https://issues.apache.org/jira/browse/SOLR-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12527364
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Thomas Peuss commented on SOLR-127:
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@Erik: Adding Etag support should be not that hard. I have a look into that. As
the Etag value I propose a hash of the request URI and the index version.
@Koji: I have a look if I can update the request count for Not-Modified
responses. The question there is only if we really want that. The current
counter tells us how many requests really reached the search handler. In my
opinion that is what I want because the Not-Modified responses put not much
pressure on the server.
> 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
> Attachments: 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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