InternetSetCookie function

Creates a cookie associated with the specified URL.


BOOL InternetSetCookie(
  _In_ LPCTSTR lpszUrl,
  _In_ LPCTSTR lpszCookieName,
  _In_ LPCTSTR lpszCookieData


lpszUrl [in]

Pointer to a null-terminated string that specifies the URL for which the cookie should be set.

lpszCookieName [in]

Pointer to a null-terminated string that specifies the name to be associated with the cookie data. If this parameter is NULL, no name is associated with the cookie.

lpszCookieData [in]

Pointer to the actual data to be associated with the URL.

Return value

Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.


Cookies created by InternetSetCookie without an expiration date are stored in memory and are available only in the same process that created them. Cookies that include an expiration date are stored in the windows\cookies directory.

Creating a new cookie might cause a dialog box to appear on the screen asking the user if they want to allow or disallow cookies from this site based on the privacy settings for the user.

Caution  InternetSetCookie will unconditionally create a cookie even if “Block all cookies” is set in Internet Explorer. This behavior can be viewed as a breach of privacy even though such cookies are not subsequently sent back to servers while the “Block all cookies” setting is active. Applications should use InternetSetCookieEx to correctly honor the user's privacy settings.

For more cookie internals, see


Like all other aspects of the WinINet API, this function cannot be safely called from within DllMain or the constructors and destructors of global objects.

Note  WinINet does not support server implementations. In addition, it should not be used from a service. For server implementations or services use Microsoft Windows HTTP Services (WinHTTP).


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]







Unicode and ANSI names

InternetSetCookieW (Unicode) and InternetSetCookieA (ANSI)

See also

HTTP Cookies
Managing Cookies
WinINet Functions