Alamofire auto refresh token and retry previous API call in iOS Swift 4

Question

now I\'m working on an iOS application in Swift 4. Here I\'m using Alamofire to integrate the API calls. I need to integrate the right way to auto-refresh the authentication tok

Answer 1

@m1sh0's answer was extremely helpful to me. I'm just adding the missing detail the OP asked for in the comments: How do you make the Alamofire request so that it uses the Retrier and Adapter?

I basically used @m1sh0's example and called it like this:

        var request_url = Constants.API_URL + "/path/to/resource"

        let sessionManager = Alamofire.SessionManager.default
        sessionManager.adapter = MyRequestAdapter.shared
        
        sessionManager.request(request_url).validate().responseJSON { (response: DataResponse) in
            switch(response.result) {
            case .success(_):
                print(response.result.value!)
                completion(response.result.value!)
            case .failure(_):
                print(response.result.error!)
                completion(response.result.error!)
                break
            }
        }

Note that you need validate() in the request in order to get retried on failure. Without it, the response is just returned for completion. Also note there's a failure case in the response block for all non-401 errors, as they are presumed unrecoverable.