14.4. Summary
This chapter has discussed a variety of mechanisms for request distribution. These mechanisms can be broadly divided into those that are oblivious to requested objects (content-blind request distribution) and those that take this information into account (content-aware request distribution).
Content-blind request distribution can in principle be performed by the client DNS server, the client itself, network routers using anycast, a balancing switch in front of a server farm, or the Web site's DNS server. All content-blind approaches require that every server replica be able to process every request for the Web site. This requirement normally means that each server must contain a replica of the entire Web site. However, using surrogates ...
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