Where is mime type stored within FHIR v3.0.1?

I am using FHIR .Net v3.0.1.

We have our own vonk server;
In sending messages to the server, they are failing.
A colleague has suggested that I check the mimetype being used to submit information to the vonk server.

Please advise: Where within the libary of code is the mime type for me to check?
I have looked on the internet; and have looked through the code, alas, I am unable to see the setting…

Please help.

Thanks

Dave

You need to provide a little more detail - what’s the failure message? What library are you using? do you need to use some kind of http tracer?