What protocol does the MID server communicate using?

The MID Server in ServiceNow primarily communicates using the SOAP protocol. This is essential for enabling the MID Server to facilitate various operations between ServiceNow and external systems, particularly in the context of discovery and integration.

Using SOAP, the MID Server can send requests to and receive responses from other systems or applications, allowing it to interact with them effectively. This protocol supports complex data types and structured messaging, making it suitable for the requirements of Discovery, where detailed and precise information exchange is necessary.

While other protocols like REST are indeed used in different scenarios within ServiceNow, SOAP is specifically designed for the types of integrations and data transfers handled by the MID Server in the context of Discovery. Thus, the use of SOAP ensures robust communication and interoperability between the MID Server and external services.