<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Thanks Amos.<div class=""><br class=""></div><div class="">As far as I can tell the only device upstream of the proxy is a relatively basic gateway/firewall. I doubt it's capable of messing with HTTP headers (and loading the site directly, as opposed to using the proxy lets it load fine behind the same gateway).</div><div class=""><br class=""></div><div class="">I’ve attached the debug output you suggested. Looks like the headers in the browser are the same as what arriving and leaving the proxy?</div><div class=""><br class=""></div><div class=""></div></body></html>