vhost_1 works without any problem and i can see both proxy_headers in the tcpdump and in my upstream-apache access-logs.
vhost_2 doesn't show me any x-forwarded headers, whether in the upstream-apache nor in the tcpdump (which is running locally on my nignx host). So it looks like when apache doesn't attach the upstream_headers to
the HTTP request.
Additionally i can see via tcpdump that HTTP protocol (get request) to vhost_2 (borken) is 1.0 and to vhost_1 (working) is 1.1; However, both responses are 1.1 so both upstream-apaches are capable of HTTP 1.1.
Does somebody know why my nginx is sending its HTTP request to vhost_2 via HTTP 1.0 and not 1.1? And if, could that be that HTTP 1.0 is not working with proxy_set_header?
Thats the only difference im seeing in my setup / tcpdump ... could there be any other difference why nginx is not attaching the upstream headers to my vhost_2?