Header (computing)

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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.


See also[edit]


  1. ^ P. Resnick, ed. (October 2008). Internet Message Format. Network Working Group. doi:10.17487/RFC5322. RFC 5322. Draft Standard. Obsoletes RFC 2822. Updates RFC 4021. Updated by RFC 6854.
  2. ^ B. Leiba (March 2013). Update to Internet Message Format to Allow Group Syntax in the "From:" and "Sender:" Header Fields. Internet Engineering Task Force. doi:10.17487/RFC6854. ISSN 2070-1721. RFC 6854. Proposed Standard. Updates RFC 5322.