Headers and binary data processing

Hello!

I'm using Ready API Pro 2.2.0 

I'm working with python-powered backend and trying to send externaly serialized data with POST request. Serialization based on apache thrift. Problem with data transfer. Not all data can recieve backend. I'm using a script assertion to deserialize my data and check data in request. In that moment it's correct.

How SoapUI work with unknown Content Types? How its processing?

In my case it's an "application/x-thrift". Is header is considered binary?