How to escape $

Hi, in the rule below, we need to insert a header with a name that starts with $. Escaping $ with \ (\$) isn't working. Is there another way to escape $ ?

 

 

when HTTP_REQUEST {

 

HTTP::header insert "\$xyz" "ValueOfXYZheader"

 

log local0.info "header is [HTTP::header value \$xyz]"

 

}

 

 

The ltm log shows:

 

Rule insert_header_rule : header is

 

The header value isn't displayed.

 

 

We've tried "\$xyz", {\$}, \$, ...

 

 

Thanks,

 

Chad