When I reverse proxy to a public echo service, I can make this work using
the server name directly, but I get an HTTP 403 if I use an upstream server
block pointing to the same domain.
Simple Scenario:
```
location / {
proxy_pass http://rve.org.uk/utils/echo-nocache.cgi/freg/;
}
```
Upstream scenario:
```
upstream app_server {
server rve.org.uk:80 <http://rve.org.uk/>;
}
server {
[...]
location / {
proxy_pass http://app_server/utils/echo-nocache.cgi/freg/;
}
```
Following a rejected defect report (see https://trac.nginx.org/ng
inx/ticket/1155#comment:1 for full nginx.conf) I have tried using:
proxy_set_header Host $proxy_host;
proxy_set_header Host $http_host;
proxy_set_header Host $host;
proxy_set_header Host rev.org.uk;
None of them work in the upstream scenario, only the first, $proxy_host
works for the simple scenario.
I have tested this on both nginx for Windows and the default Docker Hub
image (nginx/1.11.6), and had identical results.
Can anyone please tell me what I am doing wrong?
Thanks -
Francis.
--
*Multitasking creates a dopamine-addiction feedback loop, effectively
rewarding the brain for losing focus and for constantly searching for
external stimulation* - Daniel Levitin, The Organised Mind
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