Exchange 2013 "(413) Request Entity Too Large"

This error "(413) Request Entity Too Large" occurs when working with Web services Exchange 2013. Caught by a cmdlet "Test-OutlookWebServices" or Wireshark

Fix you can do this on CAS servers:
1. Back up files
C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\autodiscover\web.config
C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\ews\web.config
2. Replace the value "uploadReadAheadSize" of 0 to 1048576 (bytes) in both files

017	<serverRuntime uploadReadAheadSize="1048576" />