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According to https://tools.ietf.org/html/rfc7232#section-2.1 > Likewise, a validator is weak if it is shared by two or more representations of a given resource at the same time, unless those representations have identical representation data. For example, if the origin server sends the same validator for a representation with a gzip content coding applied as it does for a representation with no content coding, then that validator is weak. Therefore, after gzip, we should change the original etag to weak etag.