nginx match location after prefix - nginx

Question

The problem is that nginx is matching paths correctly on www.example.com/en/
or www.example.com/pl/ but not www.example.com/en/something/. If I go to www.example.com/en/something/ then I get "Welcome to nginx!" page.
When I visit www.example.com/en/ then do action that redirects to www.example.com/en/something/ - this scenario works.
I tried locations: '/en', '^~ /en'.
What's going on?
my nginx.conf is looking like this:
server {
index index.html index.htm index.nginx-debian.html;
server_name xxx; # managed by Certbot
location / {
root /usr/share/nginx/html/en;
index index.html index.htm;
try_files $uri $uri/ /index.html =404;
}
location /en/ {
root /usr/share/nginx/html;
index index.html index.htm;
try_files $uri $uri/ /index.html =404;
}
location /pl/ {
root /usr/share/nginx/html;
index index.html index.htm;
try_files $uri $uri/ /index.html =404;
}

Answer 1

With your current configuration, you use try_files $uri $uri/ /index.html =404;.
Ignoring the redundant =404 on the end, if the file is not found, the file located at /usr/share/nginx/html/index.html will be returned. And that file probably contains "Welcome to nginx!".
All parameters of the try_files directive are like URIs, and the correct URI for the /en/ index page is /en/index.html.
For example:
index index.html index.htm;
root /usr/share/nginx/html;
location /en/ {
try_files $uri $uri/ /en/index.html;
}
location /pl/ {
try_files $uri $uri/ /pl/index.html;
}
See this document for details.