Could not get the server error message from Alamofire 3.3.0

问题

It is my first time for me to use Alamofire, and it got me really frustrated.

I'm using the following code to call a signup API on the backend API

Alamofire.request(.POST, "\(self.authBaseURL)/signup", parameters: params, headers: headers, encoding: .JSON)
            .validate(statusCode: 200..<300)
            .validate(contentType: ["application/json"])
            .responseJSON { response in
                switch response.result {
                case .Success(let JSON):
                    print("Success with JSON: \(JSON)")
                    success(updatedUser)
                case .Failure(let error):
                    print("Request failed with error: \(error)")
                    failure(error)
                }

        }

The problem is that the error object I'm getting in the .Failure function doesn't contain the server side message. I have tried to access the rest of the objects (request, response, data, result) I could not find my error message anywhere

I'm always getting the following error, no matter what the server message has to say. Request failed with error:

FAILURE: Error Domain=com.alamofire.error Code=-6003 "Response status code was unacceptable: 400" UserInfo={NSLocalizedFailureReason=Response status code was unacceptable: 400}

Is there is anything wrong I'm doing?

Swift 2.2, AlamoFire 3.3.0, Xcode 7.3

回答1:

I managed to get it to work exactly the way I want is by dropping the status validation and check for the statusCode manually

Alamofire.request(.POST, "\(self.authBaseURL)/signup", parameters: params, headers: headers, encoding: .JSON)
            .validate(contentType: ["application/json"])
            .responseJSON { response in
                if response.response?.statusCode == 200 {
                    print("Success with JSON: \(response.result.value)")

                    success(updatedUser)
                }
                else {
                    let error = response.result.value as! NSDictionary
                    let errorMessage = error.objectForKey("message") as! String
                    print(errorMessage)
                    failure(errorMessage)
                }


        }

回答2:

This is how to get the error domain, code and user info with Alamofire 4 and Swift 3. User info contains the error strings.

Alamofire.request(.POST, "\(self.authBaseURL)/signup", parameters: params, headers: headers, encoding: .JSON)
            .validate(statusCode: 200..<300)
            .validate(contentType: ["application/json"])
            .responseJSON { response in
                switch response.result {
                case .Success(let JSON):
                    print("Success with JSON: \(JSON)")
                    success(updatedUser)
                case .Failure(let error):
                    let errorCode = error._code
                    let errorDomain = error._domain
                    let userInfo = error._userInfo
                    print("Request failed with error: \(error), code: \(errorCode), domain: \(errorDomain)")
                    failure(error)
                }

        }

回答3:

updated for swift 3 :

Used below lines of code:-

    Alamofire.request(escapedString!, method: .get, encoding: JSONEncoding.default)
        .validate(contentType: ["application/json"])
        .responseJSON { response in
            if response.response?.statusCode == 200 {
                print("Success with JSON: \(String(describing: response.result.value))")

            }
            else {
                let error = (response.result.value  as? [[String : AnyObject]])
                print(error as Any)
            }
    }

来源：https://stackoverflow.com/questions/36331234/could-not-get-the-server-error-message-from-alamofire-3-3-0

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swift

alamofire