Article: AJAX Web Services' Next Generation

The Connectivity Problem

One of the big limitations involved in consuming third party web services with AJAX is the difficulty in getting data straight to the browser. Cross-domain security restrictions prevent XMLHttpRequest (the cornerstone of AJAX) from being able to call up third-party URLs, and XML is too complex and tedious to parse using Javascript. In other words, you can’t easily call up Amazon’s or Google’s API from a web page on “tropicaltalent.com” without going through your own separate (proxy) server first.( 4 )

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