<1> HTTP加载失败（错误代码：-1003 [12：8]）

Question

我正在使用Xcode 9.4.1版模拟器，出现此错误：

<1> HTTP load failed (error code: -1003 [12:8])
2018-08-15 05:14:42.275912+0000 FoodTaskerMobile[10864:360131] Task <04D22041-2589-440F-AB57-2E4C2FFFF4CF>.<1> finished with error - code: -1003



  // API to login an user
    func login(userType: String, completionHandler: @escaping (NSError?) -> Void) {

        let path = "api/social/convert-token/"
        let url = baseURL!.appendingPathComponent(path)
        let params: [String: Any] = [
            "grant_type": "convert_token",
            "client_id": CLIENT_ID,
            "client_secret": CLIENT_SECRET,
            "backend": "facebook",
            "token": FBSDKAccessToken.current().tokenString,
            "user_type": userType
        ]

和

import Foundation

let BASE_URL: String = "http://loaclhost:8000"
let CLIENT_ID: String = "gvJawJBuORje858lQS4HBzTBHC84vUuzzw5vzjNi"
let CLIENT_SECRET: String = "vkqJhkDbc3UOsxpxrlaXMwuReGVrWs9T55TmDixpFTGBTlY0MAtS9WsggM5Zaojnjw8LnfxB5k7fhKUfakhmsEmQgyKKZMsnckcUY4quCCsU3PH0qwRZoraQNjiE30Nf"

我已经尝试过这种方法，但仍然没有解决。