Reverse proxies can keep a cache of static content, which further reduces the load on these internal servers and the internal network. Large websites and content delivery networks use reverse proxies, together with other techniques, to balance the load between internal servers. The resources returned to the client appear as if they originated from the reverse proxy itself. Reverse proxies help increase scalability, performance, resilience and security. In computer networks, a reverse proxy is the application that sits in front of back-end applications and forwards client (e.g. The client on the internet is unaware of the internal network, and cannot tell whether it is communicating with a proxy or directly with a web server. The internal server delivers the requested resource back to the proxy, which in turn delivers it to the client. It then forwards the request to some internal web server ( oval on the right). The proxy inspects the request, determines that it is valid and that it does not have the requested resource in its own cache. Example scenario: A client on the internet ( cloud on the left) makes a request to a reverse proxy server ( red oval in the middle).
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