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Prior to this commit, getHeaderNames() returned duplicates for the Content-Type and Content-Length headers if they were set in the wrapped response as well as in ContentCachingResponseWrapper. This commit fixes that by returning a unique set from getHeaderNames(). In addition, this commit introduces a new test in ContentCachingResponseWrapperTests to verify the expected behavior for Content-Type and Content-Length headers that are set in the wrapped response as well as in ContentCachingResponseWrapper. See gh-32039 See gh-32317