Alamofire表单编码的POST请求失败，带有responseSerializationFailed

Question

使用Alamofire（swift 4）向api端点（表单编码的内容类型）发出请求，并通过登录名传递用户名和密码。在POSTMAN中进行测试时，此端点可以正常工作并且返回有效的JSON（请参见下文）。

我的快捷代码如下：

let headers = [
  "content-type": "application/x-www-form-urlencoded",
   "cache-control": "no-cache"
 ]
let parameters = [
   "username": "user@user.com", 
   "password": "password"
 ]
 Alamofire.request("https://xxxxx.com/api/login/", method: .post, parameters: parameters, encoding:  JSONEncoding.default, headers: headers).responseJSON { response in
   print(response)
 }

我得到的答复如下：

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

任何见识将不胜感激！

Answer 1

将JSONEncoding.default更改为URLEncoding.default，如下所示，

Alamofire.request("https://xxxxx.com/api/login/", method: .post, parameters: parameters, encoding:  URLEncoding.default, headers: headers).responseJSON { response in
   print(response)
}