How to rewrite dynamic sub domain to path URI in nginx? - nginx

Question

I have a requirement where {any-dynamic-subdomain}.domain.com should rewrite to domain.com/{any-dynamic-subdomain} but not for www.domain.com
Example:
api.domain.com -> domain.com/api
api-1.domain.com -> domain.com/api-1
so on..
Note: Here subdomains are dynamic in nature.
Nginx version: openresty/1.11.2.2
Current nginx configs:
server {
listen 80;
server_name domain.com;
return 301 https://www.domain.in$request_uri;
}
server {
listen 80;
server_name www.domain.com;
set $upstream_endpoint backend-api.tools.com;
location / {
proxy_set_header HOST $upstream_endpoint;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_read_timeout 300;
proxy_pass http://$upstream_endpoint;
}
------------------------
}
Kindly advise Nginx configurations for the same. Thanks

Answer 1

You will have to use a named capture in the server_name directive:
server {
listen 80;
server_name www.domain.com;
root /var/www/htmldoc;
index index.htm index.html;
location / {
try_files $uri $uri/ =404;
}
}
server {
listen 80;
server_name ~^(?<name>[^\.]+)\.domain\.com$;
set $upstream_endpoint backend-api.tools.com;
location / {
proxy_set_header HOST $upstream_endpoint;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_read_timeout 300;
proxy_pass http://$upstream_endpoint/$name;
}
------------------------
}