Download HTTP Essentials by Stephen A. Thomas, Stephen Thomas PDF

By Stephen A. Thomas, Stephen Thomas

The 1st whole reference consultant to the basic internet protocolAs functions and providers converge and net applied sciences not just suppose HTTP yet require builders to control it, it really is changing into more and more the most important for community managers, net masters, and someone operating with HTTP to appreciate the nuts and bolts of this such a lot typical net protocol. This publication offers entire documentation and clarification of the protocol, together with complicated and experimental extensions. Readers gets center assistance on imposing HTTP 1.1 of their items, together with find out how to speed up HTTP in huge scale sites, find out how to safe it, and the way to deal with compatibility matters with models 0.9 and 1.0. HTTP switching and invisible HTTP operations equivalent to alternative negotiations, prestige assessments, and direction tracing also are tested.

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Not to be outdone, Windows systems mark the end of a line with the two-character sequence of a return followed by a linefeed. The HTTP specifications follow the same convention as Windows; they use the symbol CRLF to represent the two-character sequence. 1 The Structure of HTTP Messages As we saw in the previous chapter, http is a client/server protocol; clients issues requests, and servers respond to those requests. The http message structure mirrors that division. There is one format for http requests and another, slightly different, format for responses.

At first, it might seem that http’s rules governing the use of cookies would protect users from this type of tracking. After all, an http client can return a cookie only to the server that originally issued it. If the online broker sends the browser a cookie, how can the sporting goods site, which is on a different server, retrieve that cookie from the user? The trick, in this case, is that cookie doesn’t belong to either server. Rather, it is owned by a third party ad server that has arrangements with both the broker and sporting goods sites.

1 Cookie Attributes (continued) Attribute Status Notes Domain Optional The domain (from the Domain Name System) for which the cookie is valid; a server may not specify a domain other than one to which itself belongs, but it may specify a domain more general than a single server. Max-Age Optional The lifetime of the cookie, in seconds. Path Optional The URLs on the server to which the cookie applies. Port Optional A list of TCP ports for which the cookie applies. Secure Optional Instructs the client to only return the cookie in subsequent requests if those requests are secure; it may be used for cookies that should not be exposed to eavesdroppers.

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