Avoid repeated checksum generation for cached HttpResponses by storing checksum
in HttpResponse object.
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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
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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