About URIs

The URI where you send HTTP requests has this format:

Web_Services_SOAP_endpoint_instance_name/services/async/APIversion/Resource_address

Think of the part of the URI through the API version as a base URI which is used for all operations. The part after the API version (Resource_address) varies depending on the job or batch being processed. For example, if you're working with version 54.0 of Bulk API on your instance, your base URI would be https://yourInstance.salesforce.com/services/async/54.0.

The instance name for your organization is returned in the LoginResult serverUrl field.