Urn does not support the generic Splits.io Exchange Format, so it cannot output runs in the standard format.
However, Splits.io has limited support for reading Urn's proprietary format. These files use the extension
Urn doesn't support the Splits.io Exchange Format, so it can't read most runs from Splits.io.
However, Splits.io can try to export runs in Urn format. Look for "Urn" option when exporting a run from Splits.io.
You can request runs from the API in Urn format using this header:
Runs returned in Urn format include the header: