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Figure 9-5. Happy Halloween logo from Google

Chapter 9 - Advanced Web Performance Optimization

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).

google.com halloween logo

Figure 9-5. Happy Halloween logo from Google

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