This requires examining how pages are constructed, so the cache refreshes only those objects likely to change. One consideration is the 'cacheability' of the content itself, says Digital Island's Bill Lim, senior product marketing manager. As more Web sites employ dynamically generated content and technologies such as personalization and profiling, their ability to leverage standard caching technologies may be reduced. Many caching providers are responding by building in support for dynamic content. This includes cookie support, authentication, query strings, and dynamic page assembly.
Caches can also serve multiple functions.
Some companies position caches to act as proxy servers that can control or limit outgoing bandwidth so that multiple users can piggyback on a single IP connection more easily. There's also the danger that the proxy server can become a single point of failure. When replacing older proxy servers, it may make sense to simply drop new products in line to avoid network or client reconfigurations. However, we recommend transparent installations, which do not suffer from these drawbacks, he says.