Why do I receive no response when making a PATCH call via Connect REST API?
May 2015 and later
To successfully make a PATCH call, use POST and include in the header X-HTTP-Method-Override: PATCH
It is expected for the REST API to return an empty 200 response when updating records through PATCH requests.
For further information regarding PATCH, refer to the Connect REST API documentation under Answer ID 5169: Technical Documentation and Sample Code.