Hello,
First of all, let me give you some context. The Apache 2.2's webpage
which describes mod_headers' "RequestHeader" directive says
(specifically for the "edit" action):
RequestHeader edit header value replacement
[early|env=[!]variable]
If this request header exists, its value is transformed
according to a regular expression search-and-replace. The value argument
is a regular expression, and the replacement is a replacement string,
which may contain backreferences. Both a value and a replacement are a
regular expression and a replacement string respectively.
That's fine, but I faced a situation in my production environment where
I had two JSESSIONIDs defined in the "Cookie" header (don't ask me why)
and this was confusing the load balancing algorithm
(mod_proxy_balancer). Without getting into too much details, what I had
to do was to clean up the "Cookie" header to leave there only the
JSESSIONID that I need. This is how I thought I could do that:
SetEnvIf Cookie "JSESSIONID=([^;]+\.server.)" MYSESSIONID=$1
RequestHeader edit Cookie "(^JSESSIONID=[^;]+; |;
JSESSIONID=[^;]+)" ""
RequestHeader edit Cookie "(.*)" "$1;
JSESSIONID=%{MYSESSIONID}e" env=MYSESSIONID
The first two lines above work fine, but unfortunately the last one
doesn't because the "RequestHeader edit" directive cannot reference
environment variables in its replacement string (why?). :~(
If I understood correctly what the webpage mentioned above says, the
replacement string is just that (a fixed string) which may also contain
backreferences to groups in the value's regular expression, however,
since I was trying to append the content of an environment variable
there (in this case MYSESSIONID), I ended up with, for instance, the
following result (which is not what I wanted):
Cookie: language=en;
JSESSIONID=KKb2Ry1NJTw8tWznLH2hLCkSTkq0nnyKwSys0MbSxLvymKb89Cgn!-2531024
50; customer_type=Residential; JSESSIONID=%{MYSESSIONID}e
I was looking for something like this:
Cookie: language=en;
JSESSIONID=KKb2Ry1NJTw8tWznLH2hLCkSTkq0nnyKwSys0MbSxLvymKb89Cgn!-2531024
50; customer_type=Residential;
JSESSIONID=60685FA3BC4F0345196D00BFBFBFFC79.server2
Please, would it be possible to add this capability to the
"RequestHeader edit" directive so we would be able to use environments
variables inside the replacement string as well?
Thanks a lot!
PS: I'm running Apache 2.2.3 on RHEL 5.7
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