Chapter 7 Firewall for FortiOS 5.0 : Building firewall objects and policies : Proxy Option : Oversized Files
  
Oversized Files
A couple of variations on the example could have to do with the processing of oversized files at a level other than the default setting. The ways that it can be approached are:
1. Set a non default threshold size and block the files
2. Set a non default threshold size and not scan the files over the threshold but allow them to pass through the FortiGate firewall.
In the following instructions:
We will just use 2 MB as the new threshold.
In the CLI instructions we will limit the configuration to just the HTTP settings for the purposes of brevity and simplicity.