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Microsoft SQL Server Analysis Services uses the SOAP messaging protocol for formatting requests and responses as specified either in [SOAP1.1] or in [SOAP1.2-1/2007] and [SOAP1.2-2/2007]. It transmits these messages using HTTP [RFC7230], HTTPS [RFC2818], or TCP [RFC793].
This protocol uses SOAP over HTTP or HTTPS, as shown in the following layering diagram:

Figure 2: SOAP over HTTP or HTTPS
Analysis Services uses SOAP over Direct Internet Message Encapsulation [DIME] and TCP/IP, as shown in the following layering diagram:

Figure 3: SOAP over DIME and TCP/IP