Changes the assignee of a task to a specific user.
Note: The difference with the Claim Task method is that this method does not check if the task already has a user assigned to it.
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 set the assignee for.
Provide the id of the user that will be the assignee of the task.
The id of the user that the current action refers to.
Request successful.