Solve nginx Error 413 Request Entity Too Large

Here is a excellent tutorial show you how to Solve nginx Error 413 Request Entity Too Large:

Changing your php.ini-settings alone won’t do much. So to fix this problem, follow these steps.

Open up your nginx.conf-file, with an editor of your choice:

vim /etc/nginx/nginx.conf

..and add client_max_body_size to the http-section:

client_max_body_size 20M;

Save and close the file, apply the changes to nginx, and reload:

/usr/sbin/nginx -t
/usr/sbin/nginx -s reload