[NumLock]

Код:

var
  IdMultiPartFormDataStream: TIdMultiPartFormDataStream;
begin
  IdHTTP1.HandleRedirects:=True;
  IdHTTP1.Request.UserAgent:='Mozilla/3.0';
  IdMultiPartFormDataStream:=TIdMultiPartFormDataStream.Create;
  IdMultiPartFormDataStream.AddFile('file', 'd:\Downloads\clouds.bmp', 'image/bmp');
  Memo1.Text:=IdHTTP1.Post('http://zalil.ru/upload/', IdMultiPartFormDataStream);
  IdMultiPartFormDataStream.Free;
end;