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How to retrieve the parameters from a url in vaadin?

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Im asking a question in vaadin in this forum is because of the reason that its a servlet based engine.Im developing a facebook app in vaadin .I am using OAuth2.0 authentication as its authetication protocol.I am stuck in a particular place.After providing in the credentials of the facebook account it gets redirected to a page which is of another website followed by a parameter called "code".The url is somewhat like this


What I want is to get the value of the parameter called code.Any would be greatly appreciated!...Forgive me if this is the wrong forum to ask this question.
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