Re: [users@httpd] Apache2.2.2: mod_headers %{env-var}e

Philip Brusten <philip.brusten@xxxxxxxxxxxxxx> · Fri, 30 Jun 2006 16:07:10 +0200

Hi

Joshua Slive wrote:

On 6/30/06, Philip Brusten <philip.brusten@xxxxxxxxxxxxxx> wrote:

Hello,

I have a reverse proxy (Apache2.2.2) where I want to set a request
header "a" based on the value of another request variable "b".
Additionally, request header "b" must have a certain value. If request
header "b" doesn't match that certain value, I don't want to set request
header "a".
This is how I planned to do this:

- Check request header "b" and set an environment variable if true.
(SetEnvIf)
- Set request header "a" with value of request header "b" when the
environment variable, mentioned above, is set.

eg:
SetEnvIf MyRequestVar_b ^regex$ SET_HEADER_OK

RequestHeader set MyRequestVar_a %{HTTP_MYREQUESTVAR_B}e 

env=SET_HEADER_OK

I'm not sure what I'm doing wrong but the second line works under
Apache2 but always returns (null) under apache2.2.2. I need apache2.2.2
because of its keep-alive functionality as reverse-proxy.
Can all request headers be used for matching in the directive SetEnvIf?

Maybe I am using a wrong syntax for looking up the environment 

variables?

That's not exactly clear.  Apache 2.2.2 is a subset of Apache2.  What
is the old version anyway?

The old version is 2.0.54-5

One quess is that your have "RewriteEngine On" on the old version but
not the new version.  This has the effect of putting certain variables
into the environment that would not otherwise be there.

I've tried this, but it has no affect.
Is it possible that the reverse proxy has anything to do with this?

I don't think RequestHeader has direct access to the HTTP_ variables 

otherwise, so

you'd need to use mod_setenvif or mod_rewrite to get at that variable.

I've tested this with the Header directive and without the environment 

variable requirement. It easier to log response headers in my client 

then to do a tcpdump for logging the request headers.

The directive below worked fine for me in Apache 2.0.54-5

Header set MyRequestVar_a %{HTTP_MYREQUESTVAR_B}e

Philip

--
Brusten Philip
LUDIT - K.U.Leuven
http://shib.kuleuven.be
W. de Croylaan 52A | 3001 Heverlee | Belgium

philip.brusten@xxxxxxxxxxxxxx 

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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