invalid_request error when getting access token. RRS feed

  • Question

  • I'm trying to get my access token for my application, using this URL:

    https://datamarket.accesscontrol.windows.net/v2/OAuth2-13?grant_type=client_credentials&client_id=//CLIENT ID//&client_secret=//CLIENT SECRET//=&scope=http://api.microsofttranslator.com

    Obviously I replace //CLIENT ID// and //CLIENT SECRET// with my applications information.

    I tried encoding the tokens with HtmlEncode in my application but got a 400 error.  So I tried the request in my browser and this is the JSON response I got:

    "error_description":"ACS90007: Request method not allowed. \r\nTrace ID: 2144c829-f3fa-4ed8-80e6-40841e6a3f69\r\nTimestamp: 2012-06-27 01:11:27Z"

    I don't know what I'm doing wrong, any help?

    Wednesday, June 27, 2012 1:34 AM

All replies

  • Please try to URLEncode the client ID and client secret. The method call will fail, if either one contains URL-reserved characters.

    Let us know if this solved the situation.

    Chris Wendt
    Microsoft Translator

    Thursday, June 28, 2012 2:58 PM
  • There's a full example on using ASP.NET to get the access token here:




    See step 3.1 in the second article in particular -- you'll need to UrlEncode the Client Secret and Client ID.

    Thursday, June 28, 2012 3:01 PM
  • I am using HtmlEncode to encode the tokens, does that not do the same thing as URLEncode?

    This is my code for encoding the URL:

            Me.request = String.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope={2}", _
                                       WebUtility.HtmlEncode(clientId), _
                                       WebUtility.HtmlEncode(clientSecret), _

    edit: --

    I guess it doesn't.  But, I encoded the values manually online using a URL encoder tool and tried the Url.  And got the same error as above.

    • Edited by ecnepsnai Thursday, June 28, 2012 8:01 PM
    Thursday, June 28, 2012 7:56 PM
  • HTMLEncode and UrlEncode are different. We need UrlEncode here.
    Thursday, June 28, 2012 8:01 PM
  • Well I found a sample that was pinned on this fourm and copied the code, this is my current code:

    Public Function TranslateText(ByVal Text As String, ByVal FromLanguange As String, ByVal ToLanguange As String) As String
                Dim clientID As String = "########"
                Dim clientSecret As String = "#######"
                Dim strTranslatorAccessURI As String = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13"
                Dim strRequestDetails As String = String.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope=http://api.microsofttranslator.com", HttpUtility.UrlEncode(clientID), HttpUtility.UrlEncode(clientSecret))
                Dim webRequest As System.Net.WebRequest = System.Net.WebRequest.Create(strTranslatorAccessURI)
                webRequest.ContentType = "application/x-www-form-urlencoded"
                webRequest.Method = "POST"
                Dim bytes() As Byte = System.Text.Encoding.ASCII.GetBytes(strRequestDetails)
                webRequest.ContentLength = bytes.Length
                Using outputStream As System.IO.Stream = webRequest.GetRequestStream()
                    outputStream.Write(bytes, 0, bytes.Length)
                End Using
                Dim webResponse As System.Net.WebResponse = webRequest.GetResponse()
                ' Make sure you add a reference to System.Runtime.Serialization here
                Dim AdmToken As New AdmAccessToken
                Dim serializer As System.Runtime.Serialization.Json.DataContractJsonSerializer = New System.Runtime.Serialization.Json.DataContractJsonSerializer(AdmToken.GetType())
                Dim token As AdmAccessToken = serializer.ReadObject(webResponse.GetResponseStream())
                Dim txtToTranslate As String = Text
                Dim headerValue As String = "Bearer " + token.access_token
                Dim soapClient As New TranslatorService.LanguageServiceClient()
                Dim translatedText As String = soapClient.Translate(headerValue, txtToTranslate, FromLanguange, ToLanguange, "text/plain", "")
                Return translatedText
            End Function

    And this is the error I get:

    System.InvalidOperationException: Could not find default endpoint element that references contract 'TranslatorService.LanguageService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.
       at MyFire.myfireactions.Twitter_Status_Translate(String Text) in C:\Users\User\Documents\Visual Studio 2010\Projects\MyFire\MyFire\Modules\myfireactions.vb:line 611
       at MyFire.exceptionhandler.TranslateMessage(String TweetText) in C:\Users\User\Documents\Visual Studio 2010\Projects\MyFire\MyFire\Modules\Support Methods\exceptionhandler.vb:line 38
       at MyFire.Application.li_leftclick(StackPanel sender, MouseButtonEventArgs e) in C:\Users\User\Documents\Visual Studio 2010\Projects\MyFire\MyFire\Application.xaml.vb:line 253

    Thursday, June 28, 2012 8:48 PM
  • On what line did you get the error? 

    This looks like you may not have created a web service reference to the Translator service, which the last 3 lines of the function need (Dim soapClient onwards)..

    This is the service that you need to create a reference to: http://api.microsofttranslator.com/V2/Soap.svc

    Monday, July 2, 2012 1:55 PM