HTTP Header - Hiding Sizing Information

I'm doing some data hiding stuff.  I need to hide sizing information in an HTTP header.  When  I say sizing information, I mean an integer value ranging from 1 to 100,000.  My current HTTP header is very basic.  It has the following parameters set:

User Agent
Set Cookie
Content Legnth

How can a I manipulate the HTTP header so that I'm hiding the sizing information (an integer value) and if the lheader is examined, noone will know?  I know I can't do that with Content-length cuz that gets automatically computed.
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I don't believe you'll be able to hide it perfectly.  Your best option would be adding an X_SOMETHING header (X_...) being user-added headers.  You'd probably want to somehow encrypt the value to upon a quick glance, you won't see anything important.

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you can try apache module mod_headers, it might help
this module should be able to manipulate http request/response headers
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