Hello, you can get the client's preferences via the request#clientInfo#getAcceptedLanguages method, and treat these preferences manually. Another solution is to rely on the content negotiation algorithm that helps to find the best variant that fits the client preferences (in terms of media type and languages). Let's say my HelloWorldResource is able to generate a text representation, in both french and english. It has to declare the list of supported variants, and generate the right representation accorded to the chosen variant :
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