How to send raw json data to put method in vb.net? - vb.net

Question

i am try send raw data into PUT method , but i am getting error as "The remote server returned an error: (502) Bad Gateway"
But same data i try to use in Postman Agent, its working.
What i tried
Private Function SendRequest(uri As Uri, jsonDataBytes As Byte(), contentType As String, method As String) As String
Dim req As WebRequest = WebRequest.Create(uri)
req.ContentType = contentType
req.Method = method
req.ContentLength = jsonDataBytes.Length
req.Headers.Add("x-api-key:xxxxxY0tZN55jbXnY05Oxxxxx")
Dim stream = req.GetRequestStream()
stream.Write(jsonDataBytes, 0, jsonDataBytes.Length)
stream.Close()
Dim response = req.GetResponse().GetResponseStream()
Dim reader As New StreamReader(response)
Dim res = reader.ReadToEnd()
reader.Close()
response.Close()
Return res
End Function
Calling function
Dim postdata As String = "[{barcod:A0000041},{barcode:A0000113}]"
Dim data = Encoding.UTF8.GetBytes(postdata)
Dim Uri As New Uri("https://sample.com/xxxxx/xxxxx?funcName=UpdateBaarcode")
Dim result_post = SendRequest(Uri, data, "text/plain", "PUT")
What i missing , pls reply.
Regards,
Aravind

Answer 1

For REST API
I use WebRequest using DirectCast.
It's been so long I can't remember why. TT
Try like the code below.
Private Function SendRequest(uri As Uri, jsonDataBytes As Byte(), contentType As String, method As String) As String
Dim req As HttpWebRequest= DirectCast(WebRequest.Create(uri), HttpWebRequest)
req.ContentType = contentType
req.Method = method
req.ContentLength = jsonDataBytes.Length
req.Headers.Add("x-api-key:xxxxxY0tZN55jbXnY05Oxxxxx")
Dim stream = req.GetRequestStream()
stream.Write(jsonDataBytes, 0, jsonDataBytes.Length)
stream.Close()
Dim response = DirectCast(req.GetResponse(), HttpWebResponse)
Dim reader As New StreamReader(response.GetResponseStream)
Dim res = reader.ReadToEnd()
reader.Close()
response.Close()
Return res
End Function