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"}%%HTTP{"User-Agent"}%Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) 
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 - Related: HTTPS, REMOTE_ADDR, REMOTE_PORT, REMOTE_USER