Available inall subroutines.
Gets a header value by name.
This is equivalent to reading the
req.http.xyz style variables 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
beresp, corresponding to the predefined
variable of the same
name. The predefined variable associated with the where argument must be
writable within the VCL subroutine where
header.get() is called.
set resp.http.xyz = header.get(req, "user-agent");
is equivalent to:
set resp.http.xyz = req.http.user-agent;
See also the client request, and other request and response variables.
header.get() 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,
header.get() to return a not-set value.
header.set for valid characters in header names.