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Reverse proxy technology for web servers should be depl…

Reverse proxy technology for web servers should be deployed if:

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A.
http servers’ addresses must be hidden.

B.
accelerated access to all published pages is required.

C.
caching is needed for fault tolerance.

D.
bandwidth to the user is limited.

Explanation:
Reverse proxies are primarily designed to hide physical and logical internal structures from outside access.
Complete URLs or URIs can be partially or completely redirected without disclosing which internal or DMZ
server is providing the requested data. This technology might be used if a trade-off between security,
performance and costs has to be achieved. Proxy servers cache some data but normally cannot cache all
pages to be published because this depends on the kind of information the web servers provide. The ability to
accelerate access depends on the speed of the back-end servers, i.e., those that are cached. Thus, without
making further assumptions, a gain in speed cannot be assured, but visualization and hiding of internal
structures can. If speed is an issue, a scale-out approach (avoiding adding additional delays by passing
firewalls, involving more servers, etc.) would be a better solution. Due to the limited caching option, reverse
proxies are not suitable for enhancing fault tolerance. User requests that are handled by reverse proxy servers
are using exactly the same bandwidth as direct requests to the hosts providing the data.


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