In Windows Internet Explorer 7, the Microsoft Windows Internet (WinINet) function InternetQueryOptionW returns a value of true when you use the INTERNET_OPTION_URL option flag as the second parameter of the function. This problem occurs even though the buffer is insufficient or NULL.

For example, the clause that you use resembles the following:

bRet = InternetQueryOptionW(hHttpRequest, INTERNET_OPTION_URL, NULL, &dwSize);

You expect that the InternetQueryOptionW function will return a value of false because the buffer is NULL. However, the InternetQueryOptionW function returns a value of true.

Note This problem does not occur in earlier versions of Microsoft Internet Explorer. Also, this problem does not occur if you use the InternetQueryOptionA function.