Removes a variable that is visible to a task. A variable is visible to a task if it is a local task variable or declared in a parent scope of the task. See documentation on visiblity of variables.
Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.
The id of the task to delete the variable from.
The name of the variable to be removed.
Request successful.