Add Custom Header Parameters to Http Header

Question

Is there any working way to add custom attributes into the Http Header in the Http Request. So far
I have tried putting in Servlet filter response, httpRequest doesn't have a addHeader method. I tried Phase Listener in JSF. Nothing seems to work at all. Is there any way at all?
I use Weblogic, is there any Weblogic specific way, say some tag which can can be used to set custom header. Suggestions please.
In short, I want custom attributes in request of Http Header.

Is there any way I do something like below which is available for IIS server

<system.webServer> 
    <httpProtocol>
        <customHeaders>
            <clear />
            <add name="X-UA-Compatible" value="IE=EmulateIE7" />
        </customHeaders>
    </httpProtocol>
</system.webServer>