I have submitted a patch to allow Solr's RequestHandlers to suppress the creation of HTTP caching headers. It makes no sense for example to cache responses for the admin pages and the update handlers. There is another patch that allows partial responses with timeout. This responses should not be cached as well.
Requests that end up in an exception should not be cached as well.
The patch is registered as SOLR-505 in Apache's JIRA.



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