Nginx Show Upstream Server Name and Backend Port With URL Without Trailing Slash

Question

I have setup a Nginx server as proxy for a back-end. If the back-end is down, Nginx serves from a backup of the back-end. The proxy works when the URL ends with a trailing slash. If I omit the trailing slash, the URL shown becomes the name of the upstream block plus the port of the backup back-end.

• What works: www.chingu.asia, www.chingu.asia/, and www.chingu.asia/wiki/.
• What doesn't work: www.chingu.asia/wiki (no trailing slash), my browser is redirected to http://chingu.servers:8111/wiki/, which cannot be found (of course).

Here is my configuration:

upstream chingu.servers { server 192.168.0.12 fail_timeout=300s max_fails=1; server 192.168.0.10:8111 backup; } server { listen 80; server_name www.chingu.asia; location / { proxy_pass http://chingu.servers/; } } server { listen 192.168.0.10:8111; server_name _; root /...some path.../Chingu; index index.html index.php; location / { try_files $uri $uri/ =404; } location ~ \.php$ { try_files $uri =404; include fastcgi_params; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_pass unix:/run/php/php7.3-fpm.sock; fastcgi_param FQDN true; } } 

I have tried using regexes to match any URI with the location blocks. I also tried port_in_redirect off; and absolute_redirect off;.

I could add location block for wiki and others but it seems to defeat the purpose of a proxy if I must add manually every possible sub-directories.

What is it that I'm missing?

Answer 1

Your configuration means that nginx will use chingu.servers as the HTTP Host header when sending the request to upstream.

You need to use

location / { proxy_set_header Host $host; proxy_pass http://chingu.servers/; } 

in your configuration.

Also, you need to make sure that your Chingu root URL is set to www.chingu.asia.