(Lianja) 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).

Note: This example requires Chilkat v11.0.0 or greater.

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llSuccess = .F.

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

loHttp = createobject("CkHttp")

loResp = createobject("CkHttpResponse")
llSuccess = loHttp.HttpNoBody("HEAD","https://www.chilkatsoft.com/hamlet.xml",loResp)
if (llSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loResp
    return
endif

// Examine the response header.
? loResp.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.
lcLastModStr = loResp.GetHeaderField("Last-Modified")
// If the header exists...
if (loResp.LastMethodSuccess = .T.) then
    // Parse the RFC822 format date/time string
    loCkdt = createobject("CkDateTime")
    loCkdt.SetFromRfc822(lcLastModStr)

    // If we want to access individual date/time parts (in the local timezone)
    loDt = createobject("CkDtObj")
    loCkdt.ToDtObj(.T.,loDt)

    ? "day/month/year = " + str(loDt.Day) + "/" + str(loDt.Month) + "/" + str(loDt.Year)
endif



release loHttp
release loResp
release loCkdt
release loDt