VB.NET Requires Chilkat v11.0.0+

Get the Last-Modified Date Before HTTP Download

See more HTTP Examples

Demonstrates how to send a HEAD request to get the last-modified date of a file on a web server (without downloading the file). 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://www.chilkatsoft.com/hamlet.xml",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:

'  	Content-Length: 279658
'  	Content-Type: text/xml
'  	Last-Modified: Thu, 12 May 2016 15:14:08 GMT
'  	Accept-Ranges: bytes
'  	ETag: "c1cd8bee60acd11:0"
'  	Server: Microsoft-IIS/8.5
'  	X-Powered-By: ASP.NET
'  	X-Powered-By-Plesk: PleskWin
'  	Date: Thu, 25 Jul 2019 16:40:54 GMT

'  Get the Last-Modified header.
Dim lastModStr As String = resp.GetHeaderField("Last-Modified")
'  If the header exists...
If (resp.LastMethodSuccess = True) Then
    '  Parse the RFC822 format date/time string
    Dim ckdt As New Chilkat.CkDateTime
    ckdt.SetFromRfc822(lastModStr)

    '  If we want to access individual date/time parts (in the local timezone)
    Dim dt As New Chilkat.DtObj
    ckdt.ToDtObj(True,dt)

    Debug.WriteLine("day/month/year = " & dt.Day & "/" & dt.Month & "/" & dt.Year)
End If