Swift. Combine. Is there any way to call a publisher block more than once when retry?

Future runs its body once, as soon as it is created, even if nothing subscribes to it. It saves the result and completes all subscriptions with that same result. So using the retry operator on a Future won't make the Future run its body again on failure.

You want each subscription to run the body again. You can do that by wrapping your Future in a Deferred. The Deferred will create a new Future for every subscription.

var failPublisher: AnyPublisher<(Data, URLResponse), Error> {
    Deferred {
        Future<(Data, URLResponse), Error> { promise in
            print("Attempt to call")
            backgroundQueue.asyncAfter(deadline: .now() + Double.random(in: 1..<3)) {
                promise(.failure(TestFailureCondition.invalidServerResponse))
            }
        }
    }
    .eraseToAnyPublisher()
}

I managed to achieve the expected behaviour by utilising tryCatch() function and making another request: Link

The link contains two ways to achieve the same behaviour including Deferred {} mentioned above.