HTTP HEAD Request

Simple HTTP HEAD request to download only the HTTP header.

Download Chilkat HTTP ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATHTTPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
success: Integer;
response: IChilkatHttpResponse;

begin
http := TChilkatHttp.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := http.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(http.LastErrorText);

  end;

//  Send the HEAD request and get the response.

response := http.GetHead('http://www.chilkatsoft.com/');

if (response = nil ) then
  begin
    ShowMessage(http.LastErrorText);
  end
else
  begin

    //  Show the HTTP response code and header received.
    Memo1.Lines.Add('HTTP response code: ');
    Memo1.Lines.Add(IntToStr(response.StatusCode));

    Memo1.Lines.Add('---- FULL HEADER ----');
    Memo1.Lines.Add(response.Header);
    Memo1.Lines.Add('---------------------');

    //  How big will the full response be?  This is a good way to
    //  check the size of a download (if the URL is a .zip)
    Memo1.Lines.Add('Size of resource = ' + IntToStr(response.ContentLength));

  end;
end;