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