How to set character encoding to a request in Restlet Framework?

I am using the Restlet Framework to receive and send the data.

//Receiving the Request.
Request helpReq = new Request();

Here is my code where I want to send(set) the character encoding along with the response(helpRes)..

//Respond开发者_如何学Going to the Request
Response helpRes = client.handle(helpReq);

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The encoding applies to representations sent along with request. See the Representation.characterSet property and the Request.entity one.