välityspalvelinta

välityspalvelinta, often translated as proxy server, is a server that acts as an intermediary for requests from clients seeking resources from other servers. When a client requests a resource, such as a web page, the request is first sent to the proxy server. The proxy server then forwards the request to the destination server on behalf of the client. The response from the destination server is also sent back to the proxy server, which then forwards it to the original client.

Proxy servers can be used for various purposes. One common use is for caching, where the proxy server stores copies of frequently accessed resources. When a client requests a resource that is already in the proxy's cache, the proxy can return it directly without needing to contact the destination server, thus speeding up access and reducing network traffic.

Another significant application of proxy servers is for security and anonymity. They can hide the IP addresses of the clients, making it harder for the destination server to track their origins. Proxies can also be used to enforce network policies, filter content, or bypass geographical restrictions. Different types of proxies exist, including forward proxies, which serve clients within a network, and reverse proxies, which protect and manage servers. The implementation and functionality of a välityspalvelinta can vary widely depending on its specific purpose and configuration.