On Apr 21, 2005, at 10:41 AM, Bud P. Bruegger wrote:
> In order to leave intact the application on the backup server, could we use> a setenv mechanism on the backend server, in order to rewrite the > remote_addr variable with the x_forwarded_for variable ? No. This would require a custom apache module. (It probably wouldn't be too complicated, but you would need to be very careful about security issues.) Joshua.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 ofSetEnv NEW_VAR %{HTTP_SOME_HEADER_FIELD}eYou say above that this requires writing a custom module and earlier inquiries on the same issue, it seems haven't come up with answers either (see http://mail-archives.apache.org/mod_mbox/httpd-users/200403.mbox/ %3cF71DE20E4813974B87772D7DDACE8E510F7AB5@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx om%3e
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
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