Figure 9-5. Happy Halloween logo from Google
The Expires header works for browsers that encounter a server that switches to
HTTP 1.0, which should send only an Expires header. Of course, because Google
doesn�t use ETags, once it substitutes one of its patented seasonal logos it would
need to change the filename to make sure the logo updates in browsers (see
Figure 9-5).
Figure 9-5. Happy Halloween logo from Google