On May 20, 2005, at 06:04 AM, Alexander Mueller wrote:
I am looking for a way to rewrite HTTP headers of requests passing through in proxy mode (mod_proxy). This works in connection with mod_headers, however it only allows basic manipulation (adding, removing, changing). I would need a way to use values of existing headers and incorporate them into newly added ones.Is there maybe already some solution/module which provides such functionality or would it require a modification of mod_headers? Thanks for any insight.
Yes. This is what the mod_rewrite module is for. What you need to do is not use mod_proxy directly (i.e. ProxyPass), but do your reverse proxy handling through mod_rewrite (the [P] flag for RewriteRule). That way, you can use mod_rewrite to grab an HTTP header value and place it into an environment variable. That would allow you to access that value via mod_headers, before you go back to mod_rewrite to do the reverse proxy call.
Here's an example...
RewriteEngine on
# Get the custom header value and store in a temporary environment
variable
RewriteCond %{HTTP:X-Custom-Header-Name} (.*)
RewriteRule .* - [E=FOO_HEADER:%1]
# We need the FOO_HEADER on the proxy side of things, so we grab
the value from the temp
# variable and add it as a new HTTP header for the upcoming proxy
request
RequestHeader add X-My-FOO %{FOO_HEADER}e
# Send our request to the proxy location
RewriteRule ^/(.*)$ http://127.0.0.1:8080/$1 [P,L]
-Brian
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