• An HTTP header that can be used in an HTTP response and that does not relate to the content of the message. Response headers, like Age, Location, or Server are used to add context to the response. Not all headers appearing in a response are response headers. For example, the Content-Length header is an entity header referring to the size of the body of the response message. However, these entity requests are usually called responses headers in such a context. ← MDN Web Docs

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