Web cache

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Web cache

(1) A folder full of Web pages in the user's computer that is maintained by the Web browser for a period of time. If the local, cached page has not been updated on the Web, it is retrieved immediately by the browser, saving download time.

(2) A computer system in a network that keeps copies of the most-recently requested Web pages in memory or on disk in order to speed up retrieval. If the next page requested has already been stored in the cache, it is retrieved locally rather than from the Internet. Web caching servers (or caching servers or cache servers) sit inside the company's firewall and enable all popular pages retrieved by users to be instantly available. Since the content of Web pages can change, the caching software is always checking for newer versions of the page and downloading them. Pages will be deleted from the cache after a set amount of non-activity. See browser cache, proxy cache, transparent cache. See also Akamai.


Caching Appliance
Holding up to 2TB of Web pages, this NetCache model is called a "caching appliance," because it plugs into the network and does only Web caching. (Image courtesy of Network Appliance, Inc.)
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References in periodicals archive ?
Web caching - or saving a copy of responses to incoming content requests to serve clients that later request the same content - protects backend servers from overload and speeds up content delivery and overall web performance.
"Valve is currently working with our web caching partner to identify users whose information was served to other users, and will be contacting those affected once they have been identified," Valve said in a (http://store.steampowered.com/news/19852/) statement.
The latter has gained lots of attention in web caching. Many schemes have been proposed, considering the request frequency, the content size, the content age, etc.
With a charter to build a standardized, industry-endorsed suite of performance and efficiency benchmarks that characterize system-on-chip (SoC) performance for modern cloud and big-data related workloads (scale-out computing), the benchmarks could ultimately lead to the acceleration of a wide variety of real-world applications, including those used in unstructured data stores, web caching, web serving, elastic search, media streaming, data analytics, distributed cloud storage, and graph analytics.
Sturm, "World wide web caching: the application-level view of the internet," IEEE Communications Magazine, vol.
"An Analysis of Web Caching in Current Mobile Broadband Scenarios." In New Technologies, Mobility and Security (NTMS), 2011 4th IFIP International Conference on, pp.
Vahdat, "The trickledown effect: web caching and server request distribution," in Proceedings of the Web Caching and Content Delivery Workshop, Boston, Mass, USA, June 2001.
"DiViNetworks' technological approach is by far more solid and efficient than web caching," said Stephane BEUVELET, Deputy CEO - GROUP CTO at Telma.
"As this happens, service providers will need intelligent, high capacity Web caching to support more localized content delivery, resulting in international bandwidth cost savings, improved traffic management, and better quality of experience for end users," she added.
For example, customers who use Blue Coat, which has been providing service providers with caching solutions for the past 15 years and has over 20 patents specific to Web caching, have significantly cut infrastructure costs and delivered a more responsive Web experience with caching.
The idea behind web caching is to maintain a highly efficient but small set of retrieved results in a cache, such that the system performance can be notably improved since later user requests can be directly answered from the cache.
In addition to the 9X features listed above, the 9XE appliance offers: true cache technology, which combines web caching with continual content analysis; delegated administration, enabling access to a subset of the interface for additional administrators; high availability, with supports for active/active or active/passive network architectures; as well as centralised management and reporting.