Swift 云功能post请求未正确向IOS应用发送错误消息

我有一个iOS应用程序从谷歌云函数接收json数据

数据被检索出来，在没有错误的情况下工作正常

但是，当云函数返回错误时，下面的函数将错误识别为nil

客户端：

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()
}

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});
});

客户端输出：

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()
}

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});
});

无法解码来自服务器的响应

服务器：

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()
}

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（用于错误情况）：

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()
}

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});
});

函数执行耗时240毫秒，完成状态代码：400

---

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。我认为只有当服务器无法访问或函数不存在时，error参数才会不同于nil。因此，基本上在else子句中，您必须搜索response参数以查找错误。

那么您的说法是从cloud函数发送一个JSON对象，每个case success和error都使用相同的参数？我想我给每个json对象添加了错误，如果没有错误，就用nil填充。我想客户端是在将“return res.status（400）.send（{error:err}）；”解释为响应，而不是错误。它将进入else子句，因为它无法解码json[“clientSecret”]和json[“publishableKey”]好的，让我测试一下。我觉得你是对的。