Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

 
{Forces a download of the requested file, object, or directory 
listing from the origin server, not from the cache}

 function DownloadURL_NOCache(const aUrl: string; var s: String): Boolean;
 var
   hSession: HINTERNET;
   hService: HINTERNET;
   lpBuffer: array[0..1024 + 1] of Char;
   dwBytesRead: DWORD;
 begin
   Result := False;
   s := '';
   // hSession := InternetOpen( 'MyApp', INTERNET_OPEN_TYPE_DIRECT, nil, nil, 0); 
  hSession := InternetOpen('MyApp', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
   try
     if Assigned(hSession) then
     begin
       hService := InternetOpenUrl(hSession, PChar(aUrl), nil, 0, INTERNET_FLAG_RELOAD, 0);
       if Assigned(hService) then
         try
           while True do
           begin
             dwBytesRead := 1024;
             InternetReadFile(hService, @lpBuffer, 1024, dwBytesRead);
             if dwBytesRead = 0 then break;
             lpBuffer[dwBytesRead] := #0;
             s := s + lpBuffer;
           end;
           Result := True;
         finally
           InternetCloseHandle(hService);
         end;
     end;
   finally
     InternetCloseHandle(hSession);
   end;
 end;

 //aufrufen 
var
   s: String;
 begin
  if DownloadURL('http://www.swissdelphicenter.ch/', s) then
    ShowMessage(s);
 end;