Proxy servers China work as an intermediary between the two ends of a client/server network connection.
Proxy servers interface with network apps, most commonly servers and Web browsers. Inside corporate networks, proxy servers are set up on specially-designated internal devices. Some ISPs (Internet Service Providers) utilize proxy servers as part of providing online services to their clients.
Finally, a category of 3rd-party hosted websites called web proxy servers is available to end users on the Internet for their Web browsing sessions.
3 main features of proxy servers
Proxy servers have 3 key functions:
- Network connection sharing.
- Data caching.
- Firewall and network data filtering support.
Proxy servers, content filtering and firewalls
Proxy servers work at the App layer (layer 7) of the OSI model. They are different from traditional network firewalls which work at lower OSI layers and support application-independent filtering. The proxy servers for china are also more difficult to set up and maintain than firewalls, as proxy functionality for each app protocol like SMTP, HTTP or SOCKS have to be configured individually. However, a properly configured proxy server improves network performance and security for the target protocols.
Network administrators usually deploy both proxy server and firewall software to work in tandem, setup both proxy server software and firewall on network gateway server.
Because they function at the OSI Application layer, the filtering capability of proxy servers is more complicated compared to that of ordinary routers. For example, proxy web servers can be able to check the URL of outgoing requests for web pages by testing HTTP messages. Network administrators can use this function bar access to illegal domains but allow access to other websites.
In contrast, ordinary network firewalls cannot see the web domain names inside HTTP request messages. Besides, for incoming data traffic, ordinary routers can filter by IP address or port number, but proxy servers can filter based on app content inside the messages.
Connection sharing with proxy servers
Few years ago, 3rd-party software products were used on home networks to share the Internet connection of one desktop with other computers. Home broadband routers offer Internet connection sharing functions in most homes instead. However, on corporate networks, proxy servers are still generally employed to distribute Internet connections across local intranet networks and multiple routers.
Proxy servers and caching
The caching of Web pages by proxy servers can improve a network’s user experience in 3 ways. First, caching may conserve bandwidth on the network, increasing its scalability. Next, caching can improve response time experienced by clients. For example, with an HTTP proxy cache, Web pages can load faster into the browser. Finally, proxy server caches increase content availability. The copies of Web pages in the cache remain accessible even if the intermediate network link or original source goes offline.
With the trend of websites to dynamic database driven content, the benefit of proxy caching has turned down somewhat compared to the many years ago.
Web proxy servers
While many businesses deploy proxy servers physically connected to their internal networks, most home networks do not use them because home broadband routers supply the connection sharing capabilities and essential firewall. A separate class of proxy servers called Web proxies exists which allows users to take advantage of some proxy servers China benefits even when their own local network does not support them. Internet users most commonly looks for Web proxy services as a means to increase their privacy while surfing online, though the services offer other benefits too including caching. Some Web proxy servers charge service fees to use, while others are free.