Chris Ullman is a freelance web developer and technical author who has spent many years stewing in ASP/ASP.NET, like a teabag left too long in the pot. Coming from a Computer Science background, he gravitated towards MS technologies during the summer of ASP (1997). Since then he has written on over 25 books, most notably as lead author for Wrox's best-selling Beginning ASP/ASP.NET 1.x/2 series.
After leaving Wrox as a full time employee in August 2001, he branched out into VB.NET/C# programming and ASP.NET development and started his own business CUASP Consulting Ltd. in April 2003. He maintains a variety of sites from http://www.cuasp.co.co.uk, his "work" site, to http://www.atomicwise.com, a selection of his writings on music and art.
The latest craze for mashups involves making cross-domain calls to Web Services from APIs made publicly available by companies such as Google, Flickr and so on. Unfortunately, the XMLHttpRequest object doesn't allow calls made in one domain to a web service in another.
The article surveys the current, somewhat unsatisfactory, solutions and then assesses future directions.
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