Swift：从回调

Question

这是我正在使用的代码（登录部分成功执行，“登录成功”在控制台中可读）

@IBAction func loginAction(_ sender: Any) {
    print("loginIsExecuting")
    Server.Login(email: inputEmail.text!, password: inputPassword.text!, handlerDone:{
        print("Logged in successfully")
        Help.getData();
    }, handlerFailed: {
        print("===Failed to log in ")
        DispatchQueue.main.sync {
            self.displayAlert()
        }
    })
}

Help.swift

import Foundation

class Help {
static func getData(){
    let urlString = URL(string: "http://192.168.1.16/~peterlizak/Secway/web/app/get-auditor")
    if let url = urlString {
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            if error != nil {
                print(error)
            } else {
                let responseString = String(data: data!, encoding: .utf8)
                print(responseString) //JSONSerialization
            }
        }
        task.resume()
   }
 }
}

执行时我收到500内部服务器错误。 这是来自apache日志：

 192.168.1.16 - - [13/Oct/2017:12:04:30 +0200] "POST /~Myname/Myapp/web/app/get-auditor HTTP/1.1" 500 495

使用相同的代码仅在 Server.login 之后调用 Help.getData（） （不在当我只执行一次代码时，回调函数正在工作。但是，如果我再次单击该按钮以触发 loginAction（） ，则该功能将再次像第一个版本中那样运行：登录执行，“已成功登录“在控制台中，但是当代码尝试执行HTTP请求时，它会收到相同的HTTP 500错误。（此外，该解决方案也不可接受，因为我必须首先登录并在数据之后调用）

我正在使用symphony作为后端，这是我尝试请求的简单代码：

/**
 * @Route("/get-auditor" , name="get_auditor")
 */
public function getAuditorInfoAction(Request $request)
{
    $data = array(
        'status' => 1,
        'description' => 1,
        "header" => 1
    );
    return new JsonResponse($data);
}

修改

Server.Login

static func Login(email: String , password: String ,handlerDone:@escaping ()  -> Void,handlerFailed:@escaping ()  -> Void) {
     print("=== Server Login ===")
    let url = URL(string: "\(self.baseUrl)~peterlizak/Secway/web/app/login")!
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    let parameters = ["email": email, "password": password]

    do {
        request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted)
    } catch let error {
        print(error.localizedDescription)
    }

    CallService(request: request, handlerDone:{ json in
            ParseLoginResponse(json: json)
            handlerDone()
    }, handlerFailed: {
          handlerFailed()
    } )
}

Server.CallService

static func CallService(request:URLRequest,handlerDone: @escaping (_ json:[String:Any])  -> Void,handlerFailed: @escaping ()  -> Void)
{
    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {                                                 // check for fundamental networking error
            print("error=\(String(describing: error))")
            handlerFailed()
            return
        }

        if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
            print("statusCode should be 200, but is \(httpStatus.statusCode)")
            print("response = \(response)")
            handlerFailed()
            return
        }
        let responseString = String(data: data, encoding: .utf8)
        var json:[String:Any]
        do {
            json = (try JSONSerialization.jsonObject(with: data, options: [])) as! [String:Any]
        }
        catch {
            print("json error calling "+(request.url?.absoluteString)!+" =\(String(describing: error))")
            print("responseString = \(responseString!)")
            handlerFailed()
            return
        }
        let status = json["status"] as! Int
        if status != 0{
            handlerDone(json)
        }
        else{
            print("status is 0 = \(responseString!)")
            handlerFailed()
        }
    }
    task.resume()
}

Answer 1

HTTP 500是内部服务器错误，而不是客户端错误。服务器中与此API调用相关的方法中会有一些例外。此错误通常表示服务器出了点问题，需要调查错误跟踪。

Answer 2

您很可能会向错误的网址发送请求，因为您的代码/~peterlizak/Secway并且错误回复有/~Myname/Myapp