ViewController.swift

import UIKit
import Combine

...

class ViewController: UIViewController {
    ...
    
    override func viewDidLoad() {
        ...
        
        getAvatarFromTheServer()
            .handleEvents(receiveSubscription: { print("Subscribed", $0)}, 
                          receiveOutput: { print("Got image", $0)}, 
                          receiveCompletion: { print("Completion", $0)})
            .retry(3)
            .receive(on: DispatchQueue.main)
            .sink(receiveCompletion: { completion in
                switch completion {
                case let .failure(error):
                    print("Finished with error: \(error)")
                case .finished:
                    print("Finished")
                }
            }, receiveValue: { [weak self] image in
                self?.imageView.image = image
            })
            .store(in: &cancellables)
    }
    
    private func getAvatarFromTheServer() -> AnyPublisher<UIImage, Error> {
       ...
    }
}