(Swift 2) 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 Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let http = CkoHttp()

    var resp: CkoHttpResponse? = http.GetHead("https://www.chilkatsoft.com/hamlet.xml")
    if http.LastMethodSuccess == false {
        print("\(http.LastErrorText)")
        return
    }

    // Examine the response header.
    print("\(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.
    var lastModStr: String? = resp!.GetHeaderField("Last-Modified")
    // If the header exists...
    if resp!.LastMethodSuccess == true {
        // Parse the RFC822 format date/time string
        let ckdt = CkoDateTime()
        ckdt.SetFromRfc822(lastModStr)

        // If we want to access individual date/time parts (in the local timezone)
        var dt: CkoDtObj? = ckdt.GetDtObj(true)
        print("day/month/year = \(dt!.Day.intValue)/\(dt!.Month.intValue)/\(dt!.Year.intValue)")
        dt = nil
    }

    resp = nil

}