Cloud Function post 请求未正确向 IOS 应用程序发送错误消息

Question

我有一个 iOS 应用程序从 google 云函数接收 json 数据。

数据已检索并且在没有错误的情况下完美运行。

然而，当云函数returns出错时，下面的函数将error识别为nil

客户：

func initialize() {

        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.httpBody = try? JSONSerialization.data(withJSONObject: json)
        let task = URLSession.shared.dataTask(with: request, completionHandler: { [weak self] (data, response, error) in
            
            guard let response = response as? HTTPURLResponse,
                response.statusCode == 200,
                let data = data,
                let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String : Any],
                let clientSecret = json["clientSecret"] as? String,
                let publishableKey = json["publishableKey"] as? String else {
                
                ///////////   
               //ERROR is not being recognized
                /////////

           let message = error?.localizedDescription ?? "Failed to decode response from server."
           print("Error loading page: \(message)")
                    return
       }
})
task.resume()
}

客户端输出：

Failed to decode response from server.

服务器：

firebase.functions().httpsCallable('myFunction')(message)
    .then(result => {
    // this works perfectly and is recognized by the swift function //
    res.send({publishableKey: publishableKey, clientSecret: clientSecret});
})
.catch(err => {
    // this is not recognized by the swift function //
     console.log(err) // full of data
    return res.status(400).send({error: err});
});

日志（针对错误情况）：

Function execution took 240 ms, finished with status code: 400

Answer 1

如果您的请求失败，我认为您的错误将进入响应参数，您必须对其进行解码。我认为仅当无法访问服务器或函数不存在时，错误参数才会与 nil 不同。所以基本上在 else 子句中你将不得不搜索错误的响应参数。

Cloud Function post 请求未正确向 IOS 应用程序发送错误消息

Cloud Function post request not sending error message properly to IOS app

swift

http

post

google-cloud-functions

urlsession