Custom Inserted HTTP Header not showing up in Iplanet Logs

Question

ALL:
I have some iPlanet Enterprise/6.0 web servers sitting behind a LoadBalancer. The LoadBalancer is setup in an 'one-armed mode', and takes a client HTTP request passes it onto the server, but during this process, changes the client source IP to that of local static IP that the LoadBalancer has. Due to our setup we cannot change this.
By changing the client source IP to a local address, we have lost any useful user session tracking that was done by source IP.
To get around this, I have the LoadBalancer inserting an HTTP header with the client real source IP. Reading the NSAPI Programmer's Guide (Table 7-1 "http://docs.sun.com/source/816-5686-10/07_magnu.htm"), there is an option "%Req->headers.headername%" that can be used with 'flex-int' to log any header value.
My output from snoop looks as follows:
HTTP: ----- HyperText Transfer Protocol -----
HTTP:
HTTP: GET /plugin.do HTTP/1.1
HTTP: OrigClientAddr:10.5.4.28
HTTP: Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
HTTP: Accept-Language: en-us
HTTP: Accept-Encoding: gzip, deflate
HTTP: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
HTTP:
I have set the value to "%Req->headers.OrigClientAddr%" and it still does not show up in the log file. Any clues?
Works fine in Apache with:
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{OrigClientAddr}i\" \"%{User-Agent}i\"" headerinsert
CustomLog logs/access_log headerinsert

Answer 1

Always nice to find resolution to one's own question.
Fix was to change the header value to all lower case.
From:
"%Req->headers.OrigClientAddr%"
To:
"%Req->headers.origclientaddr%"