do something when your HTTP response finishes. swift
import Foundation
<...>
var done = false
let task = session.dataTask(with: request as URLRequest) {
(data, response, error) in
<...>
done = true
}
task.resume()
repeat {
RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.1))
} while !done
//credits https://stackoverflow.com/users/539599/raphael