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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
req: HCkHttpRequest;
resp: HCkHttpResponse;

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

http := CkHttp_Create();
req := CkHttpRequest_Create();

//  The AddHeader method corresponds to the curl "-H" argument.
CkHttpRequest_AddHeader(req,'Accept','application/json');
CkHttpRequest_AddHeader(req,'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.
CkHttpRequest_AddParam(req,'grant_type','client_credentials');

CkHttp_putLogin(http,'PAYPAL_REST_API_CLIENT_ID');
CkHttp_putPassword(http,'PAYPAL_REST_API_SECRET');

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

if (CkHttpResponse_getStatusCode(resp) <> 200) then
  begin
    Memo1.Lines.Add('Error status code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
    Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
    CkHttpResponse_Dispose(resp);
    Exit;
  end;

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

CkHttpResponse_Dispose(resp);

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);

end;