Enable cross-origin resource sharing. Cross-Site XHR Plugin Registry. Using the XHR Plugin Registry Suppose we need to securely access a web service from othersite.com.
This server can easily support the W3C Access Control specification by including this header: Now we can use cross-site XHR and XDomainRequest handling for XHR calls to this destination by simply calling: Now on IE8, if you call: This request can be handled directly in the browser with XDomainRequest. You can also use the window.name module as an XHR plugin as well. Proxy These plugins will utilize the browser’s cross-site request capability when available, however, you still need a fallback for older browsers.
This handles the remaining use cases. This will be handled directly from the browser (which is faster and more efficient) when possible, and will go to through proxy when the browser can’t handle it. There will be no difference in behavior, the registry automatically chooses the original XHR handler for this request. Security Notes HTTP Adapters Would result in a request URL: Conclusion. Cross-Origin Resource Sharing. Abstract This document defines a mechanism to enable client-side cross-origin requests.
Specifications that enable an API to make cross-origin requests to resources can use the algorithms defined by this specification. If such an API is used on resources, a resource on can opt in using the mechanism described by this specification (e.g., specifying Access-Control-Allow-Origin: as response header), which would allow that resource to be fetched cross-origin from Status of this Document This section describes the status of this document at the time of its publication. This document has been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and is endorsed by the Director as a W3C Recommendation. This W3C Recommendation of CORS was produced jointly by the Web Applications (WebApps) and Web Application Security (WebAppSec) Working Groups, and published by the WebAppSec Working Group. Table of Contents 1 Introduction This section is non-normative.
Cross-domain Ajax with Cross-Origin Resource Sharing. A couple of years ago, web developers were banging their head against the first wall in Ajax: the same-origin policy.
While we marveled at the giant step forward enabled by cross-browser support for the XMLHttpRequest object, we quickly bemoaned the fact that there was no way to make a request to a different domain from JavaScript. Everyone setup proxies on their web sites, which was the onset of a new host of open redirect problems, as a way to get around the restriction. Although developers were working around this limitation using server-side proxies as well as other techniques, the community outcry was around allowing native cross-domain Ajax requests.