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https://issues.apache.org/jira/browse/SHINDIG-586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630032#action_12630032
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John Hjelmstad commented on SHINDIG-586:
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Missed the obvious point that headers is an unmodifiable map... discussion on
shindig-dev.
> Avoid repeated checksum generation for cached HttpResponses by storing
> checksum in HttpResponse object.
> -------------------------------------------------------------------------------------------------------
>
> Key: SHINDIG-586
> URL: https://issues.apache.org/jira/browse/SHINDIG-586
> Project: Shindig
> Issue Type: Improvement
> Components: Gadget Rendering Server (Java)
> Reporter: John Hjelmstad
> Assignee: John Hjelmstad
>
> CachingContentRewriterRegistry uses checksums to generate rewritten-content
> cache keys. In the case of HttpResponse rewriting, in practice the vast
> majority of rewrites - and rewritten content cache lookups - are made using
> cached HttpResponse objects.
> To avoid recomputing checksum for each of these requests simply to look up,
> we can store checksum as a special header on HttpResponse (which is not
> serialized on output) before caching it.
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