Check File Size using HEAD Request

Demonstrates how to quickly check the size of an HTTP download by using the HEAD request.

Download: Chilkat .NET Assemblies

Dim http As New Chilkat.Http()

Dim success As Boolean

'  Any string unlocks the component for the 1st 30-days.
success = http.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox(http.LastErrorText)
    Exit Sub
End If



'  Send a HEAD request to get the response header:
Dim response As Chilkat.HttpResponse
response = http.GetHead("http://www.chilkatsoft.com/download/ChilkatDotNet2.msi")

If (response Is Nothing ) Then
    MsgBox(http.LastErrorText)
Else

    '  The ContentLength property of the HTTP response is
    '  the size of the remote file:
    TextBox1.Text = TextBox1.Text & "Size of download = " _
         & response.ContentLength & vbCrLf

End If