(Delphi) Send XMLHttpRequest and Get Response

Demonstrates how to send an HTTP XML request and retrieve the response.

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;
xmlStr: String;
urlEndpoint: String;
xmlCharset: String;
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
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

//  The XML sent in the body of the request is application
//  specified -- it should contain whatever the server-side
//  application is expecting..
xmlStr := '<?xml version="1.0" encoding="UTF-8"?><appXml><something>123</something></appXml>';

//  The PostXml method may be called to send the XMLHttpRequest
//  using the "POST" HTTP method (also known as "verb").
urlEndpoint := 'http://www.chilkatsoft.com/xmlEcho.asp';
xmlCharset := 'utf-8';

response := http.PostXml(urlEndpoint,xmlStr,xmlCharset);
if (response = nil ) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

//  The raw HTTP request sent by the above call is:
//  
POST /xmlEcho.asp HTTP/1.1
Content-Type: text/xml
User-Agent: Chilkat/1.0.0 (+http://www.chilkatsoft.com/ChilkatHttpUA.asp)
Host: www.chilkatsoft.com
Accept: */*
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*; q=0.7
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip
Content-Length: 81

<?xml version="1.0" encoding="UTF-8"?><appXml><something>123</something></appXml>


//  Examine the Body of the HTTP response
//  This would be the XML response sent by the server.
Memo1.Lines.Add(response.BodyStr);


end;