(C# UWP/WinRT) Get the Last-Modified Date Before HTTP Download

Demonstrates how to send a HEAD request to get the last-modified date of a file on a web server (without downloading the file).

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// 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 = await http.GetHeadAsync("https://www.chilkatsoft.com/hamlet.xml");
if (http.LastMethodSuccess == 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 = ckdt.GetDtObj(true);
    Debug.WriteLine("day/month/year = " + Convert.ToString(dt.Day) + "/" + Convert.ToString(dt.Month) + "/" + Convert.ToString(dt.Year));

}