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HTTP Headers

Headers are key-value metadata on requests and responses that drive protocol machinery: Authorization carries credentials, Content-Type declares the body's format, Accept states what the client can consume, and Retry-After schedules backoff. They are case-insensitive and separate from the payload.

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HTTP Headers and Cookies

HTTP header theory, within web protocols and client-server architecture, defines headers as metadata attached to a request or response that instruct the counterpart on how to handle the exchange, cat…