priority
The relative priority at which you’d like a host to handle the task, specified as a floating point value between 0.0 (lowest priority) and 1.0 (highest priority).
Declaration
var priority: Float { get set }Discussion
To provide hints to a host on how to prioritize URL session tasks from your app, specify a priority for each task. Specifying a priority provides only a hint and does not guarantee performance. If you don’t specify a priority, a URL session task has a priority of defaultPriority, with a value of 0.5.
There are three named priorities you can employ, described in URL session task priority.
You can specify or change a task’s priority at any time, but not all networking protocols respond to changes after a task has started. There is no API to let you determine the effective priority for a task from a host’s perspective.