Pascal (Lazarus/Delphi)

Send HTTP POST using non-UTF8 such as Windows-1250

See more HTTP Examples

Demonstrates how to specify the character encoding (charset) to be used for the body of an HTTP POST. 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,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  req: THttpRequest;
  json: TJsonObject;
  resp: THttpResponse;

begin
  success := False;

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

  http := THttp.Create;

  req := THttpRequest.Create;

  //  Load a JSON file containing strings with Polish chars.
  json := TJsonObject.Create;
  success := json.LoadFile('qa_data/json/has_polish_chars.json');
  if (success = False) then
    begin
      WriteLn(json.LastErrorText);
      Exit;
    end;

  //  Add the request params expected by the server-side:
  req.AddParam('tytul',json.StringOf('tytul'));
  req.AddParam('tresc',json.StringOf('tresc'));

  //  Indicate we wish to explicitly send the charset attribute in the HTTP request header.
  req.SendCharset := True;

  //  Send the POST
  //  You can send the POST to the URL below.  It will respond with the request body in quoted-printable format.
  //  Using quoted-printable, we can easily see the binary bytes for the accented chars.

  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  resp := THttpResponse.Create;
  success := http.HttpReq('https://www.chilkatsoft.com/echoPost.cshtml',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn(http.LastHeader);
  WriteLn(resp.BodyStr);

  //  Sample output:

  //  --------------------------------------------------
  //  POST /echoPost.cshtml HTTP/1.1
  //  Host: www.chilkatsoft.com
  //  Content-Type: application/x-www-form-urlencoded; charset=utf-8
  //  Content-Length: 79
  //  
  //  <pre>tytul=3DPrzyk%C5%82ad&amp;tresc=3DPrzyk%C5%82ad
  //  %82oszenie</pre>
  //  --------------------------------------------------

  //  We can see by the %C5%82 that utf-8 was sent, because %C5%82 is the 2-byte representation of a particular Polish char.

  //  -----------------------
  //  However.. we can change the charset used for the HTTP request by specifying the request object's charset.

  req.SendCharset := True;
  req.Charset := 'windows-1250';
  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  success := http.HttpReq('https://www.chilkatsoft.com/echoPost.cshtml',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn(http.LastHeader);
  WriteLn(resp.BodyStr);

  //  Sample output...
  //  You can see how the bytes used for the Polish chars are now 1-byte per char (i.e. using Windows-1250) 

  //  --------------------------------------------------
  //  POST /echoPost.cshtml HTTP/1.1
  //  Host: www.chilkatsoft.com
  //  Content-Type: application/x-www-form-urlencoded; charset=windows-1250
  //  Content-Length: 70
  //  
  //  <pre>tytul=3DPrzyk%B3ad&amp;tresc=3DPrzyk%B3ad
  //  e</pre>
  //  --------------------------------------------------


  http.Free;
  req.Free;
  json.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.