By Stephen A. Thomas, Stephen Thomas
The 1st entire reference consultant to the basic internet protocolAs functions and providers converge and net applied sciences not just think HTTP yet require builders to govern it, it really is changing into more and more the most important for community managers, internet masters, and an individual operating with HTTP to appreciate the nuts and bolts of this such a lot typical net protocol. This e-book presents whole documentation and clarification of the protocol, together with complicated and experimental extensions. Readers gets middle suggestions on imposing HTTP 1.1 of their items, together with the way to speed up HTTP in huge scale sites, easy methods to safe it, and the way to deal with compatibility matters with models 0.9 and 1.0. HTTP switching and invisible HTTP operations reminiscent of choice negotiations, prestige tests, and course tracing also are tested.
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Extra resources for HTTP Essentials
2 Status – HEAD The HEAD operation is just like a GET operation, except that the server does not return the actual object requested. 15 shows, the server returns a status code but no data. ) Clients can use a HEAD message when they want to verify that an object exists, but they don’t need to actually retrieve the object. Programs that verify links in Web pages, for example, can use the HEAD message to ensure that a link refers to a valid object without consuming the network bandwidth and server resources that a full retrieval would require.
It is in the response to this GET request that the server inserts its cookie. Later, the user browses to the sporting goods site. 32 illustrates, the Web page for this site also includes a banner ad, and that ad also resides on the ad agency’s server. 32 ᮣ A new Web site may also include objects from an external server; the external server can retrieve its cookies when the client requests those objects. In the figure Web site 2 also includes an object from the ad server. The client will request this object, and, because it’s communicating with the same server as before, it may return the server’s cookies in that request.
As we’ll see in later sections, user actions may cause other http exchanges, and it doesn’t take an end user to initiate one of these. Still, the four operations of this section remain the most basic http operations. 1 Web Page Retrieval – GET The simplest http operation of all is GET. It is how a client retrieves an object from the server. On the Web, browsers request a page from a Web server with a GET. 7 will force the browser to issue a GET request to the server asking for the new Web page to display.