Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed（错误域= NSCocoaErrorDomain代码= 3840

问题描述：

我正在研究迅速的项目，并使用Alamofire调用网络服务。
但是，在调用post方法时，出现以下错误。

I am working on swift project and calling webservice with Alamofire. But, while calling post method, I am getting following error.

Header file :

let accessTokenHeaderFile = [
    "Accept": "application/json",
    "Content-Type" :"application/json",
    "X-TOKEN" : UtilityClass.sharedInstance.accessTokenString
]

        Alamofire.request(urlString, method: .post, parameters: params as? [String:Any], encoding: JSONEncoding.default, headers: accessTokenHeaderFile).responseJSON { response in
          requestVC.removeLoader()
            switch (response.result) {
            case .success:
                if response.result.value != nil{
                    completionHandler (response.result.value)
                }
                break
            case .failure(let error):
                failureHandler (error as NSError?)
                break
            }
        }

错误为

FAILURE: responseSerializationFailed(Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.}))

有人可以建议我，如何解决这个问题，我尝试使用谷歌搜索，但是无论我发现什么答案都帮不了我。

Can anyone suggest me, how to fix this, I tried googling, but whatever I found the answers not helped me.

答

错误3840表示响应来自服务器不是有效的JSON字符串。因此，您可以检查 parameters键值可能是分配错误的原因，因为 responseString类似于responseJSON 。

Error of 3840 saying that the response from server is not a valid JSON string. So you can check you parameters key value may be it’s wrong assign because similar of responseString instead of responseJSON.

Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed（错误域= NSCocoaErrorDomain代码= 3840

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