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I'm having the worst time ever trying to find out what SOAP Salesforce uses. I haven't used it in forever the developer from our other system is asking me if it uses SOAP 1.1 or 1.2.
NOTE-I will be making a call out with a SOAP call.
Salesforce uses SOAP 1.1. If you look at the WSDL that you can generate from within the setup>develop>API and choose one of the WSDL's you will see
If it were SOAP 1.2 it would say:
Required, but never shown