VB.NET

Send a Staged Multipart REST Request

Demonstrates Rest.SendReqMultipart, which sends a multipart request using the parts configured on the object, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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VB.NET

Dim success As Boolean = False

Dim rest As New Chilkat.Rest
Dim bTls As Boolean = True
Dim bAutoReconnect As Boolean = True
success = rest.Connect("example.com",443,bTls,bAutoReconnect)
If (success = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  Configure one multipart part before sending.
rest.PartSelector = "1"
rest.AddHeader("Content-Type","text/plain")
rest.AddHeader("Content-Disposition","form-data; name=""field1""")
success = rest.SetMultipartBodyString("value1")
If (success = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  Send the multipart request using the configured parts.
success = rest.SendReqMultipart("POST","/api/upload")
If (success = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  After sending, read the response status line and header fields.  The return value is the HTTP
'  status code, or -1 if no response was received.
Dim statusCode As Integer = rest.ReadResponseHeader()
If (statusCode < 0) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("Response status code: " & statusCode)

'  Read the response body as text.
Dim responseBody As String = rest.ReadRespBodyString()
If (rest.LastMethodSuccess = False) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(responseBody)