VB.NET Requires Chilkat v11.0.0+

Get Size of File on Web Server

See more HTTP Examples

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header. VB.NET

Dim success As Boolean = False

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

Dim http As New Chilkat.Http

Dim resp As New Chilkat.HttpResponse
success = http.HttpNoBody("HEAD","https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip",resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


'  Examine the response header.
Debug.WriteLine(resp.Header)

'  Here is a sample response header:

'  Date: Thu, 01 Aug 2019 12:47:27 GMT
'  Content-Type: application/zip
'  Content-Length: 17457922
'  Connection: keep-alive
'  Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
'  Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
'  ETag: "5d41dc45-10a6302"
'  Accept-Ranges: bytes
'  Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
'  Server: cloudflare
'  CF-RAY: 4ff7ebb32ac4e1e2-ORD

'  Get the Content-Length header.
Dim contentLengthStr As String = resp.GetHeaderField("Content-Length")
'  If the header exists...
If (resp.LastMethodSuccess = True) Then
    Debug.WriteLine("Content-Length: " & contentLengthStr)
    '  Your application can convert the contentLengthStr to an integer and then use it....
End If