I’ve just faced with a cross-domain problem in making a mash-up site by using ajax call. In particular, I’m developing an igoogle gadget which should use cross-domain calls to retrieve data from a server outside of google domain.
I’ve found a good article to workaround this problem: http://developer.yahoo.com/javascript/howto-proxy.html
Among the solutions suggested in the article, I’m very pleased with JSONP approaches. Intuition of JSONP approach is that cross-domain problems will not occur for <script> tag. By exploiting this, call a cross-domain function, which designed to return json data enclosed in a function call, by using "src” attribute of <script> tag. Details can be found at http://bob.pythonmac.org/archives/2005/12/05/remote-json-jsonp/
