Chilkat Examples

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Visual Basic 6.0 Examples

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(Visual Basic 6.0) Azure Storage: CORS Preflight Blob Request

Azure Storage Blob Service REST API: Sample code to send a CORS pre-flight blob request.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

'  Azure Blob Service Example: CORS Preflight Blob Request
'  See also: https://msdn.microsoft.com/en-us/library/azure/dn535599.aspx

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim rest As New ChilkatRest

'  Connect to the Azure Storage Blob Service
Dim bTls As Long
bTls = 1
Dim port As Long
port = 443
Dim bAutoReconnect As Long
bAutoReconnect = 1
'  In this example, the storage account name is "chilkat".
Dim success As Long
success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect)
If (success <> 1) Then
    Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
    Exit Sub
End If

'  Provide Azure Cloud credentials for the REST call.
Dim azAuth As New ChilkatAuthAzureStorage
azAuth.AccessKey = "AZURE_ACCESS_KEY"
'  The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = "chilkat"
azAuth.Scheme = "SharedKey"
azAuth.Service = "Blob"
'  This causes the "x-ms-version: 2015-02-21" header to be automatically added.
azAuth.XMsVersion = "2015-02-21"
success = rest.SetAuthAzureStorage(azAuth)

'  Note: The application does not need to explicitly set the following
'  headers: x-ms-date, Authorization.  These headers
'  are automatically set by Chilkat.

'  The preflight blob request requires the following two HTTP headers.
'  The Origin is the domain from which the actual request will be issued.
success = rest.AddHeader("Origin","www.contoso.com")
'  The Access-Control-Request-Method is the HTTP method (such as GET, POST, PUT, etc.) of the actual request.
success = rest.AddHeader("Access-Control-Request-Method","PUT")

'  The expected response is a 202 response status code with no response body.
'  The name of the container or blob resource in this example is "test". (Replace "test" with your container name.)
Dim responseStr As String
responseStr = rest.FullRequestNoBody("OPTIONS","/test")
If (rest.LastMethodSuccess <> 1) Then
    Text1.Text = Text1.Text & rest.LastErrorText & vbCrLf
    Exit Sub
End If

'  When successful, the Azure Storage service will respond with a 200 response code,
'  with no response body.

'  If CORS is not enabled or no matching rule is found for the request,
'  then a 403 status code is returned, with the following status text:
'  "CORS not enabled or no matching rule found for this request."
If (rest.ResponseStatusCode <> 200) Then
    '  Examine the request/response to see what happened.
    Text1.Text = Text1.Text & "response status code = " & rest.ResponseStatusCode & vbCrLf
    Text1.Text = Text1.Text & "response status text = " & rest.ResponseStatusText & vbCrLf
    Text1.Text = Text1.Text & "response header: " & rest.ResponseHeader & vbCrLf
    Text1.Text = Text1.Text & "response body (if any): " & responseStr & vbCrLf
    Text1.Text = Text1.Text & "---" & vbCrLf
    Text1.Text = Text1.Text & "LastRequestStartLine: " & rest.LastRequestStartLine & vbCrLf
    Text1.Text = Text1.Text & "LastRequestHeader: " & rest.LastRequestHeader & vbCrLf
    Exit Sub
End If

Text1.Text = Text1.Text & "Success: Preflight Blob Request is accepted." & vbCrLf

 

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