Request headers in Tomcat

Hi guys,

Not sure if this is the right group to post to, so please excuse me if
it is not.

I am using Tomcat 5.5, and as a test I am looking at all the request
headers using request.getHeaderNames() in a JSP page. This returns
about 8 request values, such as "host", "user-agent", etc.

Now, if I do the same thing on IIS using their Request.ServerVariables
collection, I get MANY more request values that have originated from
the requesting client.

In particular, I'm interested in the "UA-pixes", and "UA-OS" request
headers that are present when the request originates from a PocketIE
browser.

Since IIS can pick up on these, the info MUST be in the header
somewhere. So why can't Jakarta/Apache see them? Is it filtering it
somehow? Is there a way I can get unfiltered results, and retrieve
these request header values that I am interested in?
Thanks in advance for any help you can offer me.

Chris.