Nginx response error 404 when processing a specific url - nginx

Question

I have updated my gems and I have lost my old nginx config. I´m setting a new config in nginx.conf. My new Nginx version is 1.17.3. The home page is loading and navigation from home is also right. But, if I directly type a specific url in my browser, Nginx responds a 404.
I don´t remember what I´m missing. My nginx.conf file:
events {
worker_connections 1024;
}
http {
upstream api.development {
# Path to Puma SOCK file, as defined previously
server unix:/tmp/puma.sock fail_timeout=0;
}
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
# set client body size to 10M #
client_max_body_size 10M;
gzip on;
server {
listen 80 default_server;
listen [::]:80 default_server ipv6only=on;
root /path-to-root/app;
index index.html index.htm;
# Proxy requests to backend API
location /api {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $host;
#proxy_set_header X-Forwarded-Proto https;
proxy_redirect off;
rewrite ^/api(.*) /$1 break;
proxy_pass http://api.development;
}
}
include servers/*;
}

Answer 1

I think I have just already got it by adding: try_files $uri $uri/ /index.html =404;
My concern is that with this line it´s working on development environment, however, in production, I haven´t updated the server yet, and I don´t see that I have any try_files enabled in my config file. So´I don´t understand if this is what I should do. I´m not skilled at all in nginx config.