Applicable to all Design Automation Engines.
There is comment in our documentation
- Fail if Autodesk.Das.Shared.Models.Request.Url is a data url, otherwise next step.
This blog tries goes in detail on what data url is and how useful it is wrt to Design Automation.
The data URI scheme is a uniform resource identifier (URI) scheme that provides a way to include data in-line in Web pages as if they were external resources,
data:[<mediatype>][;base64],<data>
data url is helpful scheme when you have small data that you would like embed inline without having the data to store behind any server storage space.
NOTE: Design Automation respects both base64 as well as URL encode data
Read full document at DA-DataURI