C#

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). C#

bool success = false;

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

Chilkat.Http http = new Chilkat.Http();

Chilkat.HttpResponse resp = new Chilkat.HttpResponse();
success = http.HttpNoBody("HEAD","https://www.chilkatsoft.com/hamlet.xml",resp);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

//  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.
string lastModStr = resp.GetHeaderField("Last-Modified");
//  If the header exists...
if (resp.LastMethodSuccess == true) {
    //  Parse the RFC822 format date/time string
    Chilkat.CkDateTime ckdt = new Chilkat.CkDateTime();
    ckdt.SetFromRfc822(lastModStr);

    //  If we want to access individual date/time parts (in the local timezone)
    Chilkat.DtObj dt = new Chilkat.DtObj();
    ckdt.ToDtObj(true,dt);

    Debug.WriteLine("day/month/year = " + Convert.ToString(dt.Day) + "/" + Convert.ToString(dt.Month) + "/" + Convert.ToString(dt.Year));
}