what is header? .....
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A header is a unit of information that precedes a data object. In a network transmission, A header is part of the data packet and contains transparent information about the file or the transmission.
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In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header is sometimes called the payload or body.
It is vital that header composition follows a clear and unambiguous specification or format, to allow for parsing.
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