Hypertext Transfer Protocol (HTTP)

  • The proxy cache acts as a buffer between the client application (such as a web browser) and the Internet. Requests are passed by the proxy to the Internet server and a copy of the returned data is stored in an on-disk cache. This process is completely transparent for the user, i.e. the proxy activity will go completely unnoticed. The benefit emerges when the same data is requested multiple times and a copy is returned directly from the cache -- speeding up Internet access and saving bandwidth.

    Requests can also be served by other "peer" caches that are geographically near you, such as typically provided by ISPs. With the absence of a hard disk, the PrivaNet 400 series requires such a peer cache to provide web accelleration. Cache hierarchies can also be defined spanning multiple proxies, useful in large networks. Data will always be fetched from the fastest-responding cache.

  • URL filtering enables you to control access to web resources via the Uniform Resource Locator, or address of the web page or object. It allows a custom policy to be enforced regarding the use of Internet resources. The URL filter works with access control lists (ACLs) to assign distinct rulesets for users, groups, IP addresses or domain lists. Rules can be defined to:

    • limit web access to a list of accepted web sites
    • block access to a list of web sites
    • block access to URLs matching specific words and character combinations
    • redirect URLs
    • You can chose to enforce rules within a specific time period, for example: to restrict Internet access between business hours. Additionally, the filter captures detailed information regarding the performance and usage of Internet services.

1-8-2011 - X/OS has moved!

X/OS has moved to a new office, but stays at the Amsterdam Science Park.