Probleme mit WinInet

[Lars]

static DWORD asd = 1234902;
  static const char* szKey = "key=";
  char* szAdditionalInfos = (char*) malloc(lstrlen(szKey2)+lstrlen(szKey)+1);
  lstrcpy(szAdditionalInfos, szKey);
  lstrcat(szAdditionalInfos, szKey2);
  lstrcat(szAdditionalInfos, "\n");  
  HINTERNET hInternet = InternetOpen("Mozilla/4.76 [en] (X11; Linux)", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, INTERNET_FLAG_ASYNC);
  hInternet = InternetConnect(hInternet, "mitglied.lycos.de", INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, NULL, (DWORD_PTR) &asd);
  hInternet = HttpOpenRequest(hInternet, "POST", "/lars/receiver.php", NULL, "http://www.web.de/", NULL, NULL, (DWORD_PTR)&asd);
  if(!HttpSendRequest(hInternet, NULL, NULL, szAdditionalInfos, lstrlen(szAdditionalInfos)))
  {
    InternetCloseHandle(hInternet);
    free((void*)szAdditionalInfos);
    return FALSE;
  }   
  InternetCloseHandle(hInternet);
  free((void*)szAdditionalInfos);
  return TRUE;

Irgendwie schlägt das SendRequest immer fehl

[Lars]

GetLastError liefert 997 (Overlapped I/O operation is in progress). Was bedeutet das?