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Mention Last-Modified change
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@ -357,6 +357,9 @@ class PageController extends ContentController
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Note this is different from `Vary: Accept-Encoding`,
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which is important for compression (e.g. gzip), and usually added by
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other layers such as Apache's mod_gzip.
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* No longer sets `Last-Modified` date in HTTP response headers in `DataObject::__construct()`.
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Uses `ETag` calculation based on response body which is more accurate,
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and resilient against partial and object caching which can produce stale `Last-Modified` values.
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* DataObject no longer automatically invokes `HTTP::register_modification_date`
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with LastModified on construction. User code should instead invoke
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`HTTPCacheControlMiddleware::singleton()->registerModificationDate()` explicitly.
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