excel barcode font 2016 PART II in Software

Encoder QR-Code in Software PART II

PART II
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CHAPTER
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Standards
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tandards make the World Wide Web go around, and by extension, they are important to cloud computing Standards are what make it possible to connect to the cloud and what make it possible to develop and deliver content In this chapter we ll look at the prevalent standards that make cloud computing possible, and also the sorts of standards that are used to develop applications on the cloud
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Application
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A cloud application is the software architecture that the cloud uses to eliminate the need to install and run on the client computer There are many applications that can run, but there needs to be a standard way to connect between the client and the cloud In this section we ll take a closer look at the protocols that are used to manage connections between both parties
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Computers need a common way to speak with one another Think of it like talking on the telephone to someone who doesn t speak English and you don t speak their language There s no way to achieve a common understanding You may be able to guess a word here or there, but for the most part, the conversation won t work Computers can t even guess a common word, so without a language in common, that communication won t happen
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HTTP
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To get a web page from your cloud provider, you ll likely be using the Hypertext Transfer Protocol (HTTP) as the computing mechanism to transfer data between the cloud and your organization HTTP is a stateless protocol This is beneficial because hosts do not need to retain information about users between requests, but this forces web developers to use alternative methods for maintaining users states For example, when a host needs to customize the content of a web site for a user, the web application must be written to track the user s progress from page to page The most common method for solving this problem is sending and receiving cookies
Part II:
Cloud Computing Technolog y
HTTP is the language that the cloud and your computers use to communicate This language isn t hard to understand, and you ve probably seen it before Say your browser wants to get a given web page The browser initiates it by saying
GET/HTTP/10 Host: wwwveltecom
The server responds with
HTTP/10 200 OK Content-Type: text/html <head> <title>Thank you for visiting Velte Publishing </title>
{The rest of the Velte Publishing web page appears here}
</body>
Let s break down this very simple example and understand what each line is telling us The first line of the browser s request, GET/HTTP/10, tells us that the browser wants to see the site s home page and that it is using version 10 of HTTP The second line, Host: wwwveltecom, says which web site the browser wants to see
NOTE It s necessary to add the web site name because many web sites share the same IP address on
the Internet and are hosted by a single server The Host: line was added a few years after HTTP was initially released, to allow for this behavior
The first line of the server s reply, HTTP/10 200 OK, is the server letting the browser know that it also speaks HTTP 10 and that the request was successful If the page did not exist, the response would have been HTTP/10 404 Not Found The second line in the server s response, Content-Type: text/html, lets that browser know that it is about to receive the web page This is how the browser can understand what to do with the data that it s about to receive If this line were Content-Type:image/jpg, then the browser would know that it would be receiving a JPG image file
HTTP 11 This example used HTTP 10, but current browsers use 11 The request and response would include a bit more information, but the differences are not distinct enough to go into The example we just used is perfectly valid and would still return the proper results The primary difference between the two is that originally, web browsers made separate HTTP requests like this for each page, each image, and every other component on the page Using HTTP 11, a browser and server can negotiate to leave the connection open and transfer all the page s components without hanging up and opening new sessions Requests HTTP defines eight methods to describe how the desired action is to be performed
on the server What this server presents whether pre-existing data or dynamically generated data depends on the implementation of the server Table 8-1 lists the different requests that can be made HTTP is the most common way you will connect your browsers with the cloud A protocol that is brewing is the XMPP
8:
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