Pascal (Lazarus/Delphi)

POST JSON Without Waiting for the Response

See more REST Examples

This example demonstrates sending a POST w/ content-type "application/json" where the body of the POST contains a JSON document. The POST is sent, but we don't wait for the response. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Rest,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bAutoReconnect: Boolean;
  sbJson: TStringBuilder;
  somePath: string;
  maxWaitMs: Integer;

begin
  success := False;

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

  rest := TRest.Create;

  //  Connect to the server using TLS
  bAutoReconnect := False;
  success := rest.Connect('example.com',443,True,bAutoReconnect);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Create some sample JSON to be sent in the body of the request.
  sbJson := TStringBuilder.Create;
  sbJson.Append('{"create": [{"name": "Woo Single #1","type": "simple","regular_price": "21.99"}]}');

  //  Add the Content-Type HTTP request header.
  rest.AddHeader('Content-Type','application/json');

  //  Just send the request.  Don't read the response.
  //  The request is sent to https://example.com/something?arg1=xyz&arg2=abc
  somePath := '/something?arg1=xyz&arg2=abc';
  success := rest.SendReqSb('POST',somePath,sbJson);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  OK, the request was sent.
  //  Close the connection.
  maxWaitMs := 50;
  rest.Disconnect(maxWaitMs);

  WriteLn('JSON POST Sent.');


  rest.Free;
  sbJson.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.