Simple example of how to force https, redirect an url and proxy in nginx

my_site.conf

##
# /etc/nginx/sites-available/my_site.conf

# forces https
server {
  listen 80;
  return 301 https://my_server$request_uri;
}

server {
  # https config
  listen 443 ssl;
  ssl_certificate /etc/nginx/ssl/my_server/server.crt;
  ssl_certificate_key /etc/nginx/ssl/my_server/server.key;
  
  root /usr/share/nginx/www;
  index index.html index.htm
  
  # redirects root to my main service
  location / {
    return 301 /my_main_service/;
  }
  
  # example of a special redirection depending on the user agent
  location /some_url {
  if ($http_user_agent ~ (android|iPhone)) {
    return 301 https://my_mobile_domain$request_uri;
  }
  
  # proxies
  location /my_main_service/ {
    # IP address of my main service
    proxy_pass http://192.168.1.101/;
  }
}

# Other commands:
#  ln -s /etc/nginx/sites-available/my_site.conf /etc/nginx/sites-enabled/my_site.conf
#  sudo nginx -s reload
#  sudo service nginx restart