Fix Nginx redirects to url:port when accessing url without slash

When accessing http://example.com/somefolder, you might get http://example.com:8080/somefolder (8080 is the port you are listening) instead, since your are missing a slash in the end. One may use rewrite to deal with it. However, a simple build-in solution is port_in_redirect off. An example is as follow:

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server {
  listen 8080;
  server_name example.com;

  port_in_redirect off; ## adding this 
  
  location / {
    root /var/www/example.com;
    index index.html;
  }
}