StatusCode error 500 when sending a POST resquest in XF - xamarin.forms

Question

I'm writing an API in EF to send FCM notifications:
[HttpPost]
public void PushNotificationToFCM(string deviceTokens, string title, string body, object data, string linkdirection)
{
...
// This registration token comes from the client FCM SDKs.
var registrationToken = deviceTokens;
// See documentation on defining a message payload.
var message = new Message()
{
Apns = new ApnsConfig { Aps = new Aps { ContentAvailable = true, Sound = "default" } },
Data = new Dictionary<string, string>()
{
{ "link", linkdirection },
},
Token = registrationToken,
Notification= new FirebaseAdmin.Messaging.Notification()
{
Title = title,
Body = body,
}
};
// Send a message to the device corresponding to the provided
// registration token.
string response = FirebaseMessaging.DefaultInstance.SendAsync(message).Result;
// Response is a message ID string.
Debug.WriteLine("Successfully sent message: " + response);
}
I tried on Postman or Swagger everything works fine.
I proceed to write the send command in XF:
.xaml.cs
protected async void SendFirebase()
{
string devicetoken = listDeviceID.deviceidphone;
string titlefirebase = "Title";
string bodyfirebase = "Description";
string linkfirebase = "https://applink/..";
await _apiService.AddNotifyFirebase(devicetoken, titlefirebase, bodyfirebase, linkfirebase);
}
public async Task AddNotifyFirebase(string devicetoken, string titlefirebase, string bodyfirebase, string linkfirebase)
{
var model = new
{
devicetoken = devicetoken,
titlefirebase = titlefirebase,
bodyfirebase = bodyfirebase,
linkfirebase = linkfirebase,
};
var json = JsonConvert.SerializeObject(model);
var content = new StringContent(json, Encoding.UTF8, "application/json");
var request = new HttpRequestMessage(HttpMethod.Post, "https://linkapi/api/SendNotifyDeviceFirebase");
request.Content = content;
var response = await client.SendAsync(request);
if (response.IsSuccessStatusCode)
{
var responseBody = await response.Content.ReadAsStringAsync();
}
}
However I get the error: StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1, Content: System.Net.Http.NSUrlSessionHandler+NSUrlSessionDataTaskStreamContent, ....
Where did I go wrong? Looking forward to everyone's help. Thank you!
Update
I check on Swagger:
Everything seems fine!
I then changed the send command back:
public async Task AddNotifyFirebase(string devicetoken, string titlefirebase, string bodyfirebase, string linkfirebase)
{
var request = new HttpRequestMessage(HttpMethod.Post, "https://xxxxxx/api/SendNotifyDeviceFirebase?deviceTokens=" + devicetoken + "&title=" + titlefirebase + "&body=" + bodyfirebase + "&linkdirection=" + linkfirebase);
//request.Headers.Add("Accept-Encoding", "gzip");
//request.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain; charset=utf-8");
HttpResponseMessage response = await client.SendAsync(request);
if (response.IsSuccessStatusCode)
{
var responseBody = await response.Content.ReadAsStringAsync();
}
}
I get the error again: StatusCode: 415, ReasonPhrase: 'Unsupported Media Type'

Answer 1

I have handled the problem. Thank you all
public async Task AddNotifyFirebase(NotifyFireBase NotifyFireBaseAdd)
{
var urlput = "......";
HttpClient client = new HttpClient();
var content = NotifyFireBaseAdd;
var stringContent = new StringContent(JsonConvert.SerializeObject(content), Encoding.UTF8, "application/json");
await client.PostAsync(urlput, stringContent);
}