- Called with the name of an HTTP request header field, returns its value. Capitalization and the use of hyphens versus underscores are not significant.
- Request headers are sent by the browser to the server. It is not possible to access the Response headers returned to the browser.
- Only returns headers permitted by site configuration. Returns '' if the header is not allowed.
- When called without a parameter, nothing is returned. See VarHTTPS for other options.

The HTTP and HTTPS macros are deprecated as of Foswiki release 2.1. and will be removed in a future release.
Parameters
Examples
| Write |
Returns |
Notes |
%HTTP% |
|
Always returns '' |
%HTTP{"Accept-language"}% |
hu-HU,hu;q=0.9 |
|
%HTTP{"User-Agent"}% |
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 |
|
%HTTP{"Cookie"}% |
|
Not allowed by default. |
HTTPS,
REMOTE_ADDR,
REMOTE_PORT,
REMOTE_USER