2.1 Transport

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Protocol servers MUST support SOAP over HTTP. Protocol servers MAY additionally support SOAP over HTTPS for securing communication with clients.

Protocol messages MUST be formatted as specified either in [SOAP1.1], section 4, or in [SOAP1.2/1], section 5. Protocol server faults MUST be returned either using HTTP Status Codes as specified in [RFC2616], section 10, or using SOAP faults as specified either in [SOAP1.1], section 4.4 or in [SOAP1.2/1] , section 5.4. The version of the SOAP fault returned MUST correspond to the version of SOAP used for the request WSDL message.