ENV{`varname`} inspect the value of an environment variable Returns the current value of the environment variable in the CGI (Common Gateway Interface) environment...
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...
HTTPS get HTTPS headers The same as % HTTP% but operates on the HTTPS environment variables present when the SSL protocol is in effect. Can be used to determine...