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Draft: Issue #3482279: Cache tags / hash collision

Erick Bonnemasou Jaccoudrequested to merge
issue/cloudflare-3482279:3482279-cache-tags-hash-collision into 2.0.x
  • Repurposes "cloudflarepurger.cache_tag_header_limit" to be the limit in bytes of the "Cache-Tag" response header contents
  • Hashes cache tags via md5() only when they're longer than 32 characters
  • Creates method regroupCacheTagsByLimit() to split cache tags into separate groups respecting the configured size limit in bytes
  • Adds multiple "Cache-Tag" response headers when over the size limit
  • Moves denylisted tags logic to its own method
  • Add unit tests for cacheTagsToHashes() and regroupCacheTagsByLimit()

Closes #3482279

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