It is used to send HTTP or HTTPS requests to a web server and load the server response data back into the script. Development versions of all major browsers support URI schemes beyond http: and https:, in particular, blob: URLs are supported. XMLHttpRequest is subject to the browser's same-origin policy: for security reasons, requests will only succeed if they are made to the same server that served the original web page. History and support The World Wide Web Consortium published a Working Draft specification for the XMLHttpRequest object on April 5, 2006, edited by Anne van Kesteren of Opera Software and Dean Jackson of W3C. Its goal is "to document a minimum set of interoperable features based on existing implementations, allowing Web developers to use these features without platform-specific code.
" Support in Internet Explorer versions 5, 5.5, and 6 REST : Paul James. REST (REpresentational State Transfer) is a phrase coined by Roy Fielding in his dissertation Architectural Styles and the Design of Network-based Software Architectures.
It is an attempt to describe the undocumented architectural design principles behind the Web. In fact you are using the World's largest and most popular REST system right now, yes, the World Wide Web. "The World Wide Web architecture has evolved into a novel architectural style that I call 'representational state transfer.' Using elements of the client/server, pipe-and-filter, and distributed objects paradigms, this style optimises the network transfer of representations of a resource. A Web-based application can be viewed as a dynamic graph of state representations (pages) and the potential transitions (links) between states. With all the talk of Web Services by the big software companies of this World, REST has (or will, maybe) come back into the limelight as an HTTP RPC protocol (like SOAP and XML-RPC).
Conclusion. A RESTful Web service. It's often hard for people to "get" REST, this is mostly due to the fact that REST isn't a tangible thing like a piece of software or even a specification, it's a selection of ideals, of best practices distilled from the HTTP specs.
I've always found that the best way to understand something is to see an example, to see the principles in action first and worry about the details later once I understand the general gist. So here's a little example of a RESTful version of a simple Web service you might already know about, the Delicious API. Delicious has “a simple REST API”, or rather, a simple POX over HTTP API, that is, it has a perfectly usable HTTP and XML based API for accessing your bookmarks and tags, but it isn't very RESTful.
Why not? First class objects aren't exposed as resources, so we can't access our bookmarks or tags directly. So (ignoring why) how can we make it better, make it more RESTful? Learn REST: A Tutorial. ReST. Representational State Transfer (REST) is a software architecture style consisting of guidelines and best practices for creating scalable web services. REST is a coordinated set of constraints applied to the design of components in a distributed hypermedia system that can lead to a more performant and maintainable architecture. REST has gained widespread acceptance across the Web as a simpler alternative to SOAP and WSDL-based Web services.
RESTful systems typically, but not always, communicate over the Hypertext Transfer Protocol with the same HTTP verbs (GET, POST, PUT, DELETE, etc.) used by web browsers to retrieve web pages and send data to remote servers. The REST architectural style was developed by W3C Technical Architecture Group (TAG) in parallel with HTTP 1.1, based on the existing design of HTTP 1.0. The World Wide Web represents the largest implementation of a system conforming to the REST architectural style. Yahoo ReST - Java Developer Center. Yahoo!
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