從ASP.NET推送通知到android web服務

Question

請幫助我，我從ASP.NET webservice（VB.NET）推送android通知的問題。 這是我的代碼。

Public sApplicationID As String = "YYY....ZZZ" 
Public sSENDER_ID As String = "222...555" 

<WebMethod()> _ 
Public Function SendMessage(ByVal RegistrationID As String, ByVal Message As String) As String 
    Dim regid As String = RegistrationID 
    Dim tRequest As WebRequest 
    tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send") 
    tRequest.Method = "post" 
    'tRequest.ContentType = " application/json" 
    tRequest.ContentType = " application/x-www-form-urlencoded" 
    tRequest.Headers.Add(String.Format("Authorization: key={0}", sApplicationID)) 

    tRequest.Headers.Add(String.Format("Sender: id={0}", sSENDER_ID)) 

    Dim postData As String = "{""collapse_key"":""score_update"",""time_to_live"":108,""delay_while_idle"":1,""data"":{""message"":""" & Convert.ToString(Message) & """,""time"":""" & System.DateTime.Now.ToString() & """},""registration_ids"":" & regid & "}" 
    Console.WriteLine(postData) 
    Dim byteArray As [Byte]() = Encoding.UTF8.GetBytes(postData) 
    tRequest.ContentLength = byteArray.Length 

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

    Dim tResponse As WebResponse = tRequest.GetResponse() 

    dataStream = tResponse.GetResponseStream() 

    Dim tReader As New StreamReader(dataStream) 

    Dim sResponseFromServer As [String] = tReader.ReadToEnd() 

    tReader.Close() 
    dataStream.Close() 
    tResponse.Close() 

    Return sResponseFromServer 
End Function 

我在測試這項服務，但我總是得到錯誤信息

System.Net.WebException: The remote server returned an error: (401) Unauthorized. 
at System.Net.HttpWebRequest.GetResponse() 

Answer 1

好像一些與認證沒有工作。按照guide，你的API密鑰無效：

如果你收到一個401 HTTP狀態代碼，你的API密鑰無效

又見使用時這個答案對於401的可能原因GCM：https://stackoverflow.com/a/11903863。它指的是一個不再存在的鏈接，但看起來非常全面。