The ‘413 Request Entity Too Large’ Error message is because you have filled in a form and are submitting it with too much data in the form. Typically this comes from uploading files.

The default size for nginx seems to be around 1MB.

To increase the form size limit update your nginx.conf with :

http {
   client_max_body_size 20M;

   server {
      ...
   }
}

To find the location of your nginx.conf file you can run:

find / -iname "nginx.conf"