Delphi ActiveX

Send a Staged Form-URL-Encoded REST Request

Demonstrates Rest.SendReqFormUrlEncoded, which sends an application/x-www-form-urlencoded request whose body is built from the query parameters added to the object.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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Delphi ActiveX

var
success: Integer;
rest: TChilkatRest;
bTls: Integer;
bAutoReconnect: Integer;
statusCode: Integer;
responseBody: WideString;

begin
success := 0;

rest := TChilkatRest.Create(Self);
bTls := 1;
bAutoReconnect := 1;
success := rest.Connect('example.com',443,bTls,bAutoReconnect);
if (success = 0) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

//  The form body is built from the query parameters added to the object.
rest.AddQueryParam('username','alice');
rest.AddQueryParam('action','login');

//  Send the application/x-www-form-urlencoded request.
success := rest.SendReqFormUrlEncoded('POST','/api/login');
if (success = 0) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
statusCode := rest.ReadResponseHeader();
if (statusCode < 0) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('Response status code: ' + IntToStr(statusCode));

//  Read the response body as text.
responseBody := rest.ReadRespBodyString();
if (rest.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(responseBody);