Problem with content negotiation (withFormat)

Tried the following controller:

import grails.converters.*

class TestController {

	def index = {
		
		withFormat {
			html { render "html" }
			json { render "json" }
		}
	}

}

With the following script:

url = new URL("http://localhost:8080/json/test/index") 
conn = url.openConnection() 
conn.addRequestProperty("content-type","application/json") 
println conn.content.text

And the response was "json". So it appears to work as expected. Please attach a sample that reproduces the problem if it is still a problem

Could it support both application/json and text/json?

By google this, it seems some frameworks use text/json by default and they'll just fail to work against grails

It does. This script works fine too:

url = new URL("http://localhost:8080/json/test/index") 
conn = url.openConnection() 
conn.addRequestProperty("content-type","text/json") 
println conn.content.text

didn't test but just read my email thread. i got problem when the http request has http header of 'Accept: text/json'.

Just quickly check the HTTP Header definition:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

14.1 Accept
The Accept request-header field can be used to specify certain media types which are acceptable for the response. Accept headers can be used to indicate that the request is specifically limited to a small set of desired types, as in the case of a request for an in-line image.

14.17 Content-Type
The Content-Type entity-header field indicates the media type of the entity-body sent to the recipient or, in the case of the HEAD method, the media type that would have been sent had the request been a GET.

It seems to me the withFormat should use 'Accept' rather than 'Content-Type' to determine response. Accept means, the client ask for content of particular type, but 'content-type' refers to the content-type that is being sent in the request. it doesn't hurt to support 'content-type' but it shouldn't ignore 'accept'

btw, accept could be complex:
Accept: text/;q=0.3, text/html;q=0.7, text/html;level=1, text/html;level=2;q=0.4, */;q=0.5

i only expect, 'Accept: text/json' should work...

This script works fine:

url = new URL("http://localhost:8080/json/test/index") 
conn = url.openConnection() 
conn.addRequestProperty("accept","application/json") 
println conn.content.text

If the grails.mime.use.accept.header setting in Config.groovy is set to true. Since Grails 1.1 it is disable by default:

grails.mime.use.accept.header=true

correction to last comment