icm/HTTP/max_request_size_KB 

You can use this parameter to protect your SAP System from a Denial-Of-Service attack (DoS).

The value of the parameter is the maximum size (KB) of an HTTP(s) request that can be forwarded by the ICM. Requests whose content length exceeds the specified value are already rejected by the ICM.

This means that no resources are required in the backend (memory, work processes).

The parameter can also be used in the SAP Web Dispatcher.

The default is 102 400 (100MB).

A value of –1 deactivates the check, that is, the length of the requests is irrelevant.