Get the variant that would be picked for a given user ID. This is useful for debugging. Note that this assumes all traffic is routed to the experiment.
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
The ID of the experiment from which to pick a variant. Use /experiments to get experiment IDs.
The name of the field containing the user ID for which to pick a variant.
OK