(Delphi ActiveX) Duplicate curl -u user:password with Chilkat HTTP

Demonstrates how to duplicate a curl command that uses the -u username:password option. (This assumes HTTP Basic Authentication, and Chilkat requires Basic authentication to be over a TLS connection.)

Duplicates the following curl command:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
req: TChilkatHttpRequest;
resp: IChilkatHttpResponse;

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

http := TChilkatHttp.Create(Self);
req := TChilkatHttpRequest.Create(Self);

// The AddHeader method corresponds to the curl "-H" argument.
req.AddHeader('Accept','application/json');
req.AddHeader('Accept-Language','en_US');

// The curl "-d" argument specifies the HTTP request body.  In this case,
// we're sending an application/x-www-form-urlencoded request, and therefore
// the body contains the URL-encoded query parameters.
req.AddParam('grant_type','client_credentials');

http.Login := 'PAYPAL_REST_API_CLIENT_ID';
http.Password := 'PAYPAL_REST_API_SECRET';

// Sends a POST request where the Content-Type is application/x-www-form-urlencoded
resp := http.PostUrlEncoded('https://api.sandbox.paypal.com/v1/oauth2/token',req.ControlInterface);
if (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

if (resp.StatusCode <> 200) then
  begin
    Memo1.Lines.Add('Error status code: ' + IntToStr(resp.StatusCode));
    Memo1.Lines.Add(resp.BodyStr);

    Exit;
  end;

// The JSON response is in the resp BodyStr property
Memo1.Lines.Add(resp.BodyStr);
Memo1.Lines.Add('-- Success.');
end;