Available inall subroutines.
Deletes a header by name.
This is equivalent to the
unset statement except that the header name
is given as a string, and may be passed dynamically.
Header names are case insensitive.
The where argument is one of the literal identifiers
is equivalent to:
See also the unset statement, the client request, and other request and response variables.
Some headers are protected. These headers cannot be unset,
header.unset() function has no effect.
See the Header reference
for which headers are protected.
header.unset() for a header which does not exist, or passing the empty string,
a not-set value, or a string that would be invalid as a header name,
also has no effect.
header.set for valid characters in header names.