I've been trying to implement a RESTful web service using Grails, following along a number of articles on the web for examples (Scott Davis has a particularly good one here: RESTful Grails). To get back XML from a Grails app that will be serving up both HTML and XML, I was setting the HTTP "Accept" header, then using content negotiation in my controller classes to determine what to send back to the client. For some reason, though, my app kept spitting back HTML even when I was specifically requesting XML.
Well, it turns out that, according to this Jira post, as of Grails 1.1, using the Accept header is disabled by default. To enable it, open up the Grails app's Config.groovy file (grails-app/conf/Config.groovy), and set "grails.mime.use.accept.header" to true.
Once I got that figured out, everything is running really smoothly.
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