class ActionDispatch::BestStandardsSupport

def call(env)
  status, headers, body = @app.call(env)
  headers["X-UA-Compatible"] = @header
  [status, headers, body]
end

def initialize(app, type = true)
  @app = app
  @header = case type
  when true
    "IE=Edge,chrome=1"
  when :builtin
    "IE=Edge"
  when false
    nil
  end
end