hmm. I'm working on a very related issue, trying to use SetEnv to copy the value of one environment variable (set via the header of the HTTP request) to another. Kind of SetEnv NEW_VAR %{HTTP_SOME_HEADER_FIELD}e[...]
I don't think Joshua's statement about needing to write a new module
applies to your situation. There is a big difference between changing
the value if the REMOTE_ADDR environment variable, which is set by the
TCP connection, and grabbing the value of an HTTP header and setting it
as a new env var for downstream use.
You may need to use a mod_rewrite call to "grab" the value of your HTTP
request header, if it's not one of the standard ones, but I would
probably use mod_rewrite anyway, since I've never really had good luck
with SetEnv (or SetEnvIf).
Give this a try:
RewriteEngine On
RewriteCond %{HTTP:HTTP_SOME_HEADER_FIELD} (.*)
RewriteRule .* - [E=New_VAR:%1]
-Brian
Cool! This just works! many thanks! -b
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