在 Swift 中使用 Alamofire 防止重定向响应

Question

我正在寻找如何在请求 web api 时防止重定向响应（状态代码 3xx）的示例代码。我正在使用 Swift 和 Alamofire 1.2。 我试过了：

delegate.taskWillPerformHTTPRedirection = { (session: NSURLSession!, task: NSURLSessionTask!, response: NSHTTPURLResponse!, request: NSURLRequest!) in
            return nil
        }

但不工作

我也尝试过：https://github.com/Alamofire/Alamofire/pull/350/files 并将我自己的代码更改为：

    var acc = self.txtAccount.text
    var pwd = self.txtPassword.text
    var url : String = "http://10.1.0.2:8081/wordpress/wp-json/users/me"
    let delegate = Alamofire.Manager.sharedInstance.delegate
    delegate.taskWillPerformHTTPRedirection = { (session: NSURLSession!, task: NSURLSessionTask!, response: NSHTTPURLResponse!, request: NSURLRequest!) in

        var request = NSMutableURLRequest(URL: NSURL(string: url)!)
        request.HTTPMethod = "GET"

        var credential = "\(acc):\(pwd)"
        var authData = credential.dataUsingEncoding(NSUTF8StringEncoding)
        var encodedAuthData = authData?.base64EncodedStringWithOptions(nil)
        var authValue = "Basic \(encodedAuthData!)"

        request.setValue(authValue, forHTTPHeaderField: "Authorization")
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("application/json", forHTTPHeaderField: "Accept")
        return request
    }

    //I've implemented URLRequestConvertible 'Router'. it also have call the same above url
    Alamofire.request(Router.Authorize(acc, pwd))
        .response({(request, response, data, error) in
            println(request)
        })

但它不起作用，似乎变成了无限循环。我在查尔斯身上测试过。

Answer 1

使用 AlamoFire 2.4 (Xcode7) 的替代（代码 sn-p）解决方案。就我而言，我总是期待重定向。 （我正在解压缩一个缩短的链接。）如果 request.response 调用中的完成运行，那对我来说是一个错误。

func printRedirectUrl() {

    // taskWillPerformHTTPRedirectionWithCompletion: ((NSURLSession, NSURLSessionTask, NSHTTPURLResponse, NSURLRequest, NSURLRequest? -> Void) -> Void)?
    Alamofire.Manager.sharedInstance.delegate.taskWillPerformHTTPRedirectionWithCompletion = { session, task, response, request, completion in
        // request.URL has the redirected URL inside of it, no need to parse the body
        print("REDIRECT Request: \(request)")
        if let url = request.URL {
            print("Extracted URL: \(url)")
        }
        Alamofire.Manager.sharedInstance.delegate.taskWillPerformHTTPRedirection = nil // Restore redirect abilities
        return
    }

    // We expect a redirect, so the completion of this call should never execute
    let url = NSURL(string: "https://google.com")
    let request = Alamofire.request(.GET, url!)
    request.response { request, response, data, error in
        print("Logic Error, response should NOT have been called for request: \(request)")
        Alamofire.Manager.sharedInstance.delegate.taskWillPerformHTTPRedirection = nil // Restore redirect abilities - just in case
    }
}

重定向请求：{ URL：https://www.google.com/}

提取的网址：https://www.google.com/

Answer 2

在 Swift 4 中，

let delegate = Alamofire.SessionManager.default.delegate

        delegate.taskWillPerformHTTPRedirection = { (session, task, response, request) -> URLRequest? in
           // print("REDIRECT Request: \(request)")
            return nil
        }

Answer 3

看起来返回nil 可能会导致死锁。相反，请尝试使用相同的原始 URL 创建一个新的NSURLRequest。请参阅之前的 Alamofire PR 中的 @jhersh 的 notes 以及他的 tests 中的 cmets 和实现。

如何停止重定向

func disallowRedirect() {
    let URL = "http://google.com/"
    let delegate = Alamofire.Manager.sharedInstance.delegate

    delegate.taskWillPerformHTTPRedirection = { session, task, response, request in
        return NSURLRequest(URL: NSURL(string: URL)!)
    }

    let request = Alamofire.request(.GET, URL)
    request.response { request, response, data, error in
        println("Request: \(request)")
        println("Response: \(response)")
        println("Data: \(NSString(data: data as! NSData, encoding: NSUTF8StringEncoding))")
        println("Error: \(error)")
    }
}

disallowRedirect()

您不能将nil 传递给NSURLSessionTaskDelegate 方法的completionHandler 的事实看起来像一个错误。我将为此提交一份雷达文件，完成后我将发布错误报告的链接。

Answer 4

你好其实很简单

Alamofire 有一个重定向器，可以

例子

let request = AF.request("https://google.com",method: .post,parameters: parameters)
.cURLDescription { description in
            debugPrint(description)
        }
        let redirector = Redirector(behavior: .doNotFollow)
        request.redirect(using: redirector)

它不会重定向

它也在高级用法部分的文档中

Answer 5

我不知道您的 Alamofire 版本是否支持公共委托。上次我检查委托是私人的。我正在使用@jhersh 所做的更改。您可以通过以下 github pr 查看他的添加以及如何使用委托。 https://github.com/Alamofire/Alamofire/issues/314