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Otherwise a 200 response without an ETag could be incorrectly associated to previous content in the following scenario: * The remote server had in the past responded with an ETag for this resource, which was cached. - (Otherwise, onlyETag would be empty) * That was the only ETag cached for this resource. - (Otherwise, onlyETag would be empty) * The remote server then stopped supporting ETag/If-None-Match for this resource at all. - (Otherwise, it would respond with a 304 or a 200+ETag) Signed-off-by: Robert Estelle <robertestelle@gmail.com>