if you don't create any cache (like benchmark as default one) and run the benchmark with http protocol you will not receive an exception like

IllegalArgumentException: Could not find cache benchmark

Also if you don't specify the user and password into the URI you will not receive the following exception:

SecurityException: ISPN006017: Unauthorized 'PUT' operation

The benchmark using http protocol will continue running even without any cache created and showing at the end a result based on nothing

The sabe behavior doesn't happen when you run the benchmark with hotrod protocol