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Your [Sinatra](http://sinatrarb.com) app: ```ruby get '/' do callback = params.delete('callback') # jsonp json = {'your' => 'data'}.to_json if callback content_type :js response = "#{callback}(#{json})" else content_type :json response = json end response end ``` Your HTML: ```ruby ``` You can also do the same with jQuery: ```ruby $.ajax({ type: 'get', url: '/', dataType: 'jsonp', success: functio
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