How to post a SOAP message to web API end point

Hi,
I want to paste a SOAP XML based message to Web API which i have created in ASP.NET core project template.

Right now i am getting unsupported media type error when i post it with content-type as application/soap+xml.

I know that we should be sending SOAP message to WCF based service but our requirement is like this only. I should be able to consume SOAP message in web API.

Thanks,

Sudama