Make rails url_helpers use https in production - ruby-on-rails

Question

I use Rails url_helpers to build resources urls in my app.
An example of a url in development is http://localhost:3000/resource/1, generated by the resource_url(resource) url_helper.
I use nginx in production to proxy_pass the requests to my rails app. My nginx listens on port 433 https and redirects to my rails app on port 5000 http:
server {
listen 443 ssl;
server_name api.staging.zup.me;
ssl_certificate /etc/ssl/certs/cert.crt;
ssl_certificate_key /etc/ssl/certs/cert.key;
location / {
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $host:$server_port;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://localhost:5000;
}
}
Because the request that my Rails app receives from the nginx proxy is http, it is generating the urls like, http://example.com/resource/1, but only in production I want all my urls to use https, for example, https://example.com/resource/1.
What is the best way to make Rails generate urls with the https protocol only in production?

Answer 1

You can use redirect in nginx and never touch rails app to enable https:
server {
listen 80 default_server deferred;
server_name myserver.domain;
return 301 https://$server_name$request_uri; # enforce https
}
# HTTPS server
server {
listen 443;
server_name myserver.domain;
ssl on;
ssl_certificate /etc/nginx/ssl/myserver.domain.crt;
ssl_certificate_key /etc/nginx/ssl/myserver.domain.key;
root /srv/www/myserver;
...
}
Not sure if it's a best way, but I like it becuase you don't have to do anything with rails app, only nginx.