Pascal (Lazarus/Delphi)

HTTP POST JSON (application/json)

See more HTTP Examples

Demonstrates how to send a JSON POST using the application/json content-type. 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.Http,
  Chilkat.HttpRequest,
  Chilkat.HttpResponse;

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

procedure RunDemo;
var
  success: Boolean;
  req: THttpRequest;
  http: THttp;
  jsonText: string;
  resp: THttpResponse;

begin
  success := False;

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

  req := THttpRequest.Create;
  http := THttp.Create;

  //  If any custom headers need to be included with the POST, add them
  //  by calling SetRequestHeader

  //  Note: An application should never explicitly set the Content-Length header.
  //  The Content-Length is automatically computed and added by Chilkat.

  //  Here are some examples of custom headers.  

  //  Perhaps your particular app needs some sort of custom-computed Authorization header...
  http.SetRequestHeader('Authorization','my-custom-computed-auth-value');

  //  Another custom header for some hypothetical app:
  http.SetRequestHeader('X-Pass-Timestamp','my-custom-computed-timestamp-value');

  //  The following "Accept" header may be set, but it really isn't necessary:
  http.SetRequestHeader('Accept','application/json');

  jsonText := '{ some JSON text ... }';

  //  To use SSL/TLS, simply use "https://" in the URL.

  resp := THttpResponse.Create;
  success := http.HttpStr('POST','http://www.someserver.com/someJsonEndpoint',jsonText,'utf-8','application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Display the JSON response.
  WriteLn(resp.BodyStr);


  req.Free;
  http.Free;
  resp.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.