August 2013 Archive


1680
User-Server Interaction: Cookies
User-Server Interaction: Cookies

We cited above that an HTTP server is stateless. This makes server design simpler and has allowed engineers to develop high-performance Web servers that can manage thousands of simultaneous TCP connections. Nevertheless, it is frequently desirable for a Web site to identify

Tags cookies, end system, back-end database,
1679
Web Caching
Web Caching

A Web cache - also called a proxy server - is a network entity that satisfies HTTP requests on the behalf of an origin Web server. The Web cache has its own disk storage and keeps copies of recently requested objects in this storage. As shown in Figure 1, a user's browser can be

Tags web cache, proxy server, network entity, router, internet delay
1361
The Conditional GET
The Conditional GET

Though caching can decrease user-perceived response times, it initiates a new problem - the copy of an object residing in the cache may be stale. In other words, the object housed in the Web server may have been modified since the copy was cached at the client. Fortunately,

Tags web server, conditional get, proxy cache, internet protocol, http protocol
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