2.1 Transport

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Protocol servers MUST support SOAP over HTTP. Protocol servers SHOULD 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 [SOAP1.2-1/2007] 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 in either [SOAP1.1] section 4.4 or in [SOAP1.2-1/2007] section 5.4.