Hi!
413 Status Code Explained
The 413 status code indicates that the request was larger than the server can handle, either due to physical constraints or settings.
Why it occurs
Usually, this occurs when a file is sent using the POST method from a form, and the file is larger than the maximum size allowed in the server settings. The content of the request is more than the server can process. The request may have included a message body, which is not always permissible.
Read also this: http://www.addedbytes.com/articles/for-beginners/http-status-codes/
Cheers
Julia