Improve caching on raw endpoints

Igor Drozdovrequested to merge
id-improve-raw-endpoints-caching into master

What does this MR do and why?

Related issue: #263246 (closed)

This MR does the following:

  • Serves strong ETags, making it possible for CF to cache those resources
  • Set appropriate headers on responses to allow CF optimizing the caching
Edited by Igor Drozdov

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