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HTTP -- get HTTP headers

• Called with the name of an HTTP header field, returns its value. Capitalization and the use of hyphens versus underscores are not significant.
• Syntax: %HTTP%
• Syntax: %HTTP{"Header-name"}%
• Examples:

  %HTTP%
  %HTTP{"Accept-language"}%	en-us,en-gb,en;q=0.7,*;q=0.3
  %HTTP{"User-Agent"}%	LinkupBot/1.0 (LinkupBot for web indexing; https://linkup.so/bot; bot@linkupPLEASENOSPAM.so)

• Limitation: For security reasons, the COOKIE field value cannot be retrieved. You can add or delete hidden fields by changing the {HTTP}{HiddenFields} configuration parameter.
• Note: You can see the HTTP headers your browser sends to the server on a number of sites e.g. http://www.ericgiguere.com/tools/http-header-viewer.html
• Category: SystemInformationVariables
• Related: HTTPS, REMOTE_ADDR, REMOTE_PORT, REMOTE_USER

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