server blocks of nginx configuration

nginx.conf

server {
  listen 80 default_server;
  rewrite     ^   https://$server_name$request_uri? permanent;
}

server {

  listen 443 ssl default_server;

  ssl_certificate /etc/nginx/ssl/ssl-bundle.crt;
  ssl_certificate_key /etc/nginx/ssl/ssl-private.key;

  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

  ssl_prefer_server_ciphers on;
  ssl_dhparam /etc/nginx/ssl/dhparams.pem;
  ssl_ciphers "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EECDH EDH+aRSA RC4 !aNULL !eNULL !LOW !3DES !MD5 !EXP !PSK !SRP !DSS !RC4";

  add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";

  gzip on;
  gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

  access_log /proc/self/fd/1;
  error_log /proc/self/fd/1 info;

  client_max_body_size 50m;

  location / {
    proxy_pass http://app;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }
}