<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'>Hi,<br><br>I'm have following configuration.<br> nginx 1.10.3 installed on ubuntu 16.04<br><br>one upstream <br><br><div style="margin-left: 40px; font-style: italic;">upstream backend {<br> server app01.local.net:81;<span style="white-space: pre;"> <br> </span>server app02.local.net:81;<br> server app03.local.net:81;<br>}<br><br><br></div>one vhost that dose proxy_pass http://backend;<br><br>i also have a old nginx setup that was done some time ago, on every request its add a header X-Backend:app01, depending on with backed the request is sent.<br>i tried to reproduce the setup with no success, i checked all files but did not find any configuration that is setting X-Backend on the nginx side.<br><br>can someone help me with this issue.<br><br>Thanks.<br><br>Vuko <br><br></div></body></html>