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Headers

Headers and HTTP

Headers are pieces of information about a web document sent before the document itself, to identify properties of it.

They could, for example, indicate whether a document was successfuly found, whether the response is complete or partial, and what kind of document (HTML, PDF, Excel etc) is being sent.

They should not be confused with either the document HEAD (which is part of the document itself) or HEADINGS which are part of the document structure of HTML documents.

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