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Enable Cross-Origin Resource Sharing to Allow Cross-Site JSON
We just discovered our open data wasn't nearly as open as we believed. Turns out for true cross-site requests of JSON data you need to add a HTTP Reponse Header:
The method one uses to do so vary widely by webserver and host. In our case, for IIS7 the simplest method was to configure it in the web.config:
<?xml version="1.0" encoding="utf-8"?> <configuration> <system.webServer> <httpProtocol> <customHeaders> <add name="Access-Control-Allow-Origin" value="*" /> </customHeaders> </httpProtocol> </system.webServer> </configuration>
For more information on the why and how as well as directions for other webservers visit enable-cors.org. The folks behind hacks.mozilla.org also offer a solid overview of Cross-site XmlHttpRequest with CORS. Use the form at http://enable-cors.org/#check to see if your site is CORS enabled.
At this time only IFWIS Core is CORS-Enabled on IDFG's website.
Posted by idfg-bthomas at 02/05/2011 in
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