Internal Server Error 500 when calling a REST service in VB - json

Question

I'm working with a coworker's code trying to recreate his REST web service in a console application. I'm very new to web services and VB so it's been quite difficult for me. It will work fine on his but I keep getting an Internal Server Error (500). I have looked this up and some suggestions I found were changing "POST" to "GET" but I received "Cannot get content body with this verb-type". I've seen forums about something like this not working from another person's machine. My coworker and I have tried going through it over and over but getting the same results.
This is the Console App
Imports System
Imports System.Collections.Generic
Imports System.IO
Imports System.Linq
Imports System.Net
Imports System.Reflection
Imports System.Text
Imports System.Threading.Tasks
Imports System.Web
Imports System.Web.UI
Imports System.Xml
Module RestConsoleClient
Private req As HttpWebRequest = Nothing
Private res As HttpWebResponse = Nothing
Private responseText As String = ""
Sub Main(args As String())
Dim url As String = ""
Try
If args.Count < 1 OrElse String.IsNullOrEmpty(args(0)) Then
Console.WriteLine("Endpoint Address is required as commandline argument;" _
& vbCrLf & "Copy/Paste one of the endpoint addresses from My.Settings into the Debug commandline arguments section" _
& vbCrLf & vbCrLf & "Press ENTER to start over...")
Console.ReadKey()
Return
Else
url = args(0)
End If
req = CType(WebRequest.Create(url), HttpWebRequest)
req.Method = "POST"
'** The conditions below allowed for generic raw data to be input as text vs. processing input data as a json object.
'** These conditions became redundant with the addition of config for WebContentTypeMapper and corresponding class to accept
'** a post declared with application/json ContentType as generic raw data, and then SUBSEQUENTLY de/serialize the json data as necessary
'If url.Contains("streamweaver") Then
' req.ContentType = "text"
'ElseIf url.Contains("auth") Then
' req.ContentType = "application/json" '; charset=utf-8"
'Else
' 'No other options are yet determined
'End If
req.Timeout = 30000
Dim sJson As String = "{""Name"":""Ashu"",""Age"":""29"",""Exp"":""7 Years"",""Technology"":"".NET""}"
Dim postBytes = Encoding.UTF8.GetBytes(sJson)
req.ContentLength = postBytes.Length
Dim requestStream As Stream = req.GetRequestStream()
requestStream.Write(postBytes, 0, postBytes.Length)
res = CType(req.GetResponse(), HttpWebResponse)
' I retained the basics for response reception even though it was not integral to this test
Dim responseStream As Stream = res.GetResponseStream()
Dim streamReader = New StreamReader(responseStream)
responseText = streamReader.ReadToEnd()
Console.WriteLine("HTTP Response: " & res.StatusCode & " - " & res.StatusDescription.Trim)
Console.WriteLine("[ Response Data: " & responseText.Trim & " ]")
Console.ReadKey()
Catch ex As Exception
Console.WriteLine(ex.Message)
Console.ReadKey()
End Try
End Sub
End Module
This here is the Interface
Imports System.IO
Imports System.ServiceModel
Imports System.ServiceModel.Web
<ServiceContract> _
Public Interface IRestServiceImpl
'<OperationContract> _
'<WebInvoke(Method:="GET", ResponseFormat:=WebMessageFormat.Xml, BodyStyle:=WebMessageBodyStyle.Wrapped, UriTemplate:="xml/{id}")> _
'Function XMLData(id As String) As String
'<OperationContract> _
'<WebInvoke(Method:="GET", ResponseFormat:=WebMessageFormat.Json, BodyStyle:=WebMessageBodyStyle.Wrapped, UriTemplate:="json/{id}")> _
'Function JSONData(id As String) As String
<OperationContract> _
<WebInvoke(Method:="POST", ResponseFormat:=WebMessageFormat.Json, RequestFormat:=WebMessageFormat.Json, BodyStyle:=WebMessageBodyStyle.Bare, UriTemplate:="auth")> _
Function Auth(rData As Stream) As ResponseData
<OperationContract> _
<WebInvoke(Method:="POST", ResponseFormat:=WebMessageFormat.Json, RequestFormat:=WebMessageFormat.Json, BodyStyle:=WebMessageBodyStyle.Bare, UriTemplate:="streamweaver")> _
Function StreamWeaver(sData As Stream) As String
End Interface
And here is the class
Imports System
Imports System.IO
Imports System.Reflection
Imports System.Security.AccessControl
Imports System.Text
Imports Newtonsoft.Json
Public Class RestServiceImpl
Implements IRestServiceImpl
Private filePathOnServer As String = My.Settings.OutputFolder
'Public Function XMLData(id As String) As String Implements IRestServiceImpl.XMLData
' Return "You requested product " & id
'End Function
'Public Function JSONData(id As String) As String Implements IRestServiceImpl.JSONData
' Return "You requested product " & id
'End Function
Public Function Auth(request As Stream) As ResponseData Implements IRestServiceImpl.Auth
Dim streamReader = New StreamReader(request)
Dim requestText As String = streamReader.ReadToEnd()
Dim rData As RequestData = JsonConvert.DeserializeObject(Of RequestData)(requestText)
Dim response = New ResponseData() With { _
.Name = rData.Name, _
.Age = rData.Age, _
.Exp = rData.Exp, _
.Technology = rData.Technology _
}
Dim fileOutput As String = "As of " & DateTime.Now & ", " _
& response.Name.Trim & " is a person who is " _
& response.Age.Trim & " years old, having " _
& response.Exp.Trim & " of experience with " _
& response.Technology.Trim & " technology."
Console.SetError(New StreamWriter("C:\Users\apearson\Documents\Eureka.txt"))
Console.[Error].WriteLine(fileOutput)
Console.[Error].Close()
Dim ctx As WebOperationContext = WebOperationContext.Current
If rData IsNot Nothing Then
ctx.OutgoingResponse.StatusCode = Net.HttpStatusCode.Accepted
Else
ctx.OutgoingResponse.StatusCode = Net.HttpStatusCode.NotAcceptable
End If
Return response
End Function
Public Function StreamWeaver(reqData As Stream) As String Implements IRestServiceImpl.StreamWeaver
StreamWeaver = Nothing
Dim ctx As WebOperationContext = WebOperationContext.Current
If reqData IsNot Nothing Then
ctx.OutgoingResponse.StatusCode = Net.HttpStatusCode.Accepted
Else
ctx.OutgoingResponse.StatusCode = Net.HttpStatusCode.NotAcceptable
End If
Dim streamReader As StreamReader = New StreamReader(reqData)
StreamWeaver = streamReader.ReadToEnd()
Console.SetError(New StreamWriter(filePathOnServer.Trim & "\RestServiceJSONRaw.txt"))
Console.[Error].WriteLine(DateTime.Now & ": " & vbCrLf & StreamWeaver.Trim)
Console.[Error].Close()
Return StreamWeaver
End Function
End Class
If there is anymore information needed, let me know. Again, this is kind of new to me.