Modify incoming cookie / connection input filter

[Daniel Eckstein <suppressed>]

Dear listmember,

as I am new to the list, so please let me disclaim, that I already 
searched the archives, read at perl.apache.org and other documentation, 
I am insane and sensible. :)

I am trying to modify incoming http cookie on the fly. The setup is like

user->webserver->bea connector->bea appserver

Iam using Apache 2.0.52, mod_perl 1.99, perl 5.8.5, Redhat AS Server 4.

Primary goal is to modify incoming cookies before they reach the 
connector module for bea. It would be even possible to put a additional
reverse proxy before the webserver to accomplish this. Like

user->reverse proxy -> webserver-> bea connector -> bea appserver

The first idea was to modify the cookie using simple a Perlhandler. But
this perlhandler seem to write to the response stream, which is going 
back to the client, so the modified cookie never reached the 
connector/appserver (which I can see out of its logfile).

Second idea was to use connection input filter to modify the cookie
information right in the incoming apache chain. I managed to setup the
example connection input filter from

http://perl.apache.org/docs/2.0/user/handlers/filters.html#Connection_Input_Filters

It is working, but from my opinion not as expected. I cant see any
header information written to the log, nor do I know, how I should
modify header and write them back into the input chain.

Example output:
------------
data: HTTP/1.1 304 Not Modified

data: Date: Fri, 01 Jun 2007 08:33:55 GMT

data: S
data: S
data: erver: Apache/2.0.58 (Red Hat)

data: C
data: C
data: onnection: close

data:
data:
data:
---------------

Would you please shed some light on this?

Thanks alot in advance!

Rgds,
Daniel