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error 'The given key was not present in the dictionary' when trying to API HTTP request token with Blue Prism

  • 1.  error 'The given key was not present in the dictionary' when trying to API HTTP request token with Blue Prism

    Posted 09-19-2019 21:01

    Im trying to use the Blue Prism object HTTP request to get an access token for further processing the items. However, i couldn't manage to get the token due to the error 'The given key was not present in the dictionary'. I have looked all parameters and still didn't manage to solve the issue. I use a built in visual basic code to get the result as a collection which is later parsed to JSON to get the token.

    Output parameter Input parameter

    The underlying visual basic code is:

    If forcePreAuth Then
       'Sometimes a web server will require the authorisation header in the initial request
       'In which case we have to add the basic authorization header manually.
       Dim bytes() As Byte = System.Text.Encoding.UTF8.GetBytes(String.Format('{0}:{1}',username,password))
       Dim base64 As String = Convert.ToBase64String(bytes)
       request.Headers.Add('Authorization', 'Basic ' & base64)
      If Not String.IsNullOrEmpty(username) AndAlso Not String.IsNullOrEmpty(password) Then
        request.Credentials = New NetworkCredential(username,password)
      End If
    End If
    If useProxy Then
        Dim proxyURI As New Uri(proxyURL)
        Dim proxy As New WebProxy(proxyURI, True)
        Dim proxyCred As New NetworkCredential(proxyUsername, proxyPassword)
        Dim credCache As New CredentialCache()
        credCache.Add(proxyURI, 'Basic', proxyCred)
        proxy.UseDefaultCredentials = False
        proxy.Credentials = credCache
        request.Proxy = proxy
    End If
    request.Method = method
    request.ContentType = contentType
    Dim httpRequest As HttpWebRequest = TryCast(request, HttpWebRequest)
    If httpRequest IsNot Nothing Then
      If Not String.IsNullOrEmpty(accept) Then
        httpRequest.Accept = accept
      End If
      If Not String.IsNullOrEmpty(certID) Then
      End If
    End If
    For Each r As DataRow In headers.Rows
        For Each c As DataColumn In headers.Columns
            Dim columnName As String = c.ColumnName
            Dim val As String = r(columnName).ToString
        Exit For 'Only one row is allowed
    If Not String.IsNullOrEmpty(body) Then
      Dim requestStream As IO.Stream = request.GetRequestStream()
      Using sw As New IO.StreamWriter(requestStream, New Text.UTF8Encoding(False))
      End Using
    End If
    Using response As WebResponse = request.GetResponse()
      Dim responseStream As IO.Stream = response.GetResponseStream()
      Dim sr As New IO.StreamReader(responseStream)
      resultData = sr.ReadToEnd()
    End Using```
    Disclaimer: This content was auto-posted from Stackoverflow. The original Stackoverflow question is here Stackoverflow Post, posted by ChenChela.