title: django add context based on request to all views
body: <p>I need to render my site without navbar if there is an argument in the request like nv=false and I want to pass a variable to context based on this so that the main template shows the block or not. my site also has lots of json-rpc functions, and I don't want to add extra overhead on it. how can I do this without rewriting all my views? (they are not class based and my site uses django 1.8)</p>