Google 当我使用 .NET Core HttpClient 时，FCM 给了我 BadRequest

Question

我正在尝试使用 FCM API 在 android 应用程序上发送推送通知。如果我使用像 Insomnia 或 Postman 这样的 HTTP 客户端，它会很好用。下面是画面吗：

和headers：

当然，我有一个注册 ID 和 FCM 服务器密钥，而不是 xxx。

但我需要从我的 C# 代码发送相同的内容。我总是 BadRequest。我不明白为什么。

这是我的代码：

var json = JsonConvert.SerializeObject(new
{
    to = customer.FcmRegistrationId,
    notification = new
    {
        body = push.PushBody,
        title = push.PushTitle,
        sound = "default"
    }
});

var content = new StringContent(json, Encoding.UTF8, "application/json");

var request = new HttpRequestMessage
{
    RequestUri = new Uri("https://fcm.googleapis.com/fcm/send"),
    Content = content,
};

request.Headers.TryAddWithoutValidation("Authorization", 
    "key=" + customer.FCMServerKey);

HttpResponseMessage response;

using (var client = new HttpClient())
{
    response = await client.SendAsync(request);
}

response.EnsureSuccessStatusCode();
var responseBody = await response.Content.ReadAsStringAsync();

因为我以前一直很伤心，所以我总是有这样的答案：

请帮帮我！

Answer 1

我测试了一种发送推送通知的方法：使用 WebRequest.Create

请设置 devId（您在 fcm 注册设备上的注册 ID），SERVER_API_KEY 和 SENDER_ID 来自您的 fcm 帐户。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Net;

namespace SendMsgByFCM
{
    public partial class Form1 : Form
    {

        AndroidGCMPushNotification fcmPush = new AndroidGCMPushNotification();


        public Form1()
        {
            InitForm();
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
             **devId** = "faxgYiWv4Sk:APA91bGehlGNNGaE20djfaJ5xzQst_b190GvrEwm_yvPsZvY-.....";
            fcmPush.SendNotification(devId, 'message ...' );
            MessageBox.Show( "msg send" );
        }
    }

    public class AndroidGCMPushNotification
    {

        public string SendNotification(string deviceId, string message)
        {
            string **SERVER_API_KEY** = "AAAADtSR7s8:APA91bHhhsjRMeL2gH6Qzv5BbdJyshOtgJ-J....";

            var **SENDER_ID** = "636988888888";
            var value = message;
            WebRequest tRequest;
            tRequest = **WebRequest.Create**("https://fcm.googleapis.com/fcm/send");
            tRequest.Method = "post";
            tRequest.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
            tRequest.Headers.Add(string.Format("Authorization: key={0}", SERVER_API_KEY));

            tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));

            string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "&registration_id=" + deviceId + "";
            Console.WriteLine(postData);
            Byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            tRequest.ContentLength = byteArray.Length;

            Stream dataStream = tRequest.GetRequestStream();
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close();

            WebResponse tResponse = tRequest.GetResponse();

            dataStream = tResponse.GetResponseStream();

            StreamReader tReader = new StreamReader(dataStream);

            String sResponseFromServer = tReader.ReadToEnd();


            tReader.Close();
            dataStream.Close();
            tResponse.Close();
            return sResponseFromServer;
        }
    }
}

Answer 2

我已经借助以下代码解决了这个问题：

using (var client = new HttpClient())
{

client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", $"key={ServerKey}");
var obj = new
{
    to = Id,
    notification = new
    {
        title = Title,
        body = Message

    }
};

//serialize object data to json
string json = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
// create an http string content
var data = new StringContent(json, Encoding.UTF8, "application/json");
HttpResponseMessage response = await client.PostAsync("https://fcm.googleapis.com/fcm/send", data);
return response.StatusCode;

...

这里有完整的源代码https://github.com/frankodoom/Firebase.Notification/blob/master/Firebase.Network.Standard/Firebase.cs

我不知道为什么，但原始来源中的 data 和 text 不起作用。使用 title 和 body.

Google 当我使用 .NET Core HttpClient 时，FCM 给了我 BadRequest

Google FCM gives me BadRequest when I use .NET Core HttpClient

c#

dotnet-httpclient

.net-core

firebase-cloud-messaging