nother feature of this valve is to replace the apparent scheme
    (http/https), server port and <code>request.secure</code> with the scheme presented
    by a proxy or a load balancer via a request header
    (e.g. "X-Forwarded-Proto").</p>

    <p>This Valve may be used at the <code>Engine</code>, <code>Host</code> or
    <code>Context</code> level as required. Normally, this Valve would be used
    at the <code>Engine</code> level.</p>

    <p>If used in conjunction with Remote Address/Host valves then t