Download A practical guide to content delivery networks by Gilbert Held PDF

By Gilbert Held

Defining the fashionable content material supply community as a gaggle of geographically dispersed servers deployed, often through 3rd events, to facilitate the distribution of data generated by way of world-wide-web publishers in a well timed and effective demeanour, Held examines their position in facilitating the distribution of varied sorts of internet site visitors, starting from common web content to streaming video and audio. He describes how such networks function, the benefits and drawbacks linked to utilizing them, and elements of net structure and protocols which are essential to comprehend the applying of the networks. Readers are assumed to be development human-resource or monetary functions, websites, or comparable providers. disbursed within the US by way of CRC.

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HTTP messages fall into three broad categories: Request, Response, and Close. Request message Every HTTP interaction between client and server commences with a client request. The client operator enters a URL in the browser, by either clicking on a hyperlink, typing the URL into the browser address field, or by selecting a bookmark. Because of one of the preceding actions, the browser retrieves the selected resource. 0 In this HTTP request, the User-Agent represents the software that retrieves and displays the Web content.

Fm Page 19 Friday, July 22, 2005 4:36 PM The second graph indicates response time in milliseconds (ms). The response time represents a round trip computed by sending traffic from one location to another and back. 9 you view a third graph labeled packet loss. That graph indicates the percent of packets dropped by the router or otherwise lost. Typically, routers discard packets when they become overloaded. This represents a measurement of network reliability. 9 represent bottlenecks when information flows between ISP networks.

9 Simple-Response. 0 client capable of receiving a Full-Response should never generate a Simple-Request. Secondly, the Request-line begins with a request method token, followed by the Request-URL and the protocol version, ending with a carriage return, line feed (CRLF). Thus, for a Full-Request, Request-line=Method SP Request-URL SP HTTP-Version CRLF. 0: Method=“GET”/”HEAD”/”POST”/extension method and, extension-method=token The GET token is used to retrieve information identified by the Request-URL.

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