new(app, exceptions_app = nil) public

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# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 39
    def initialize(app, exceptions_app = nil)
      if [true, false].include?(exceptions_app)
        ActiveSupport::Deprecation.warn "Passing consider_all_requests_local option to ActionDispatch::ShowExceptions middleware no longer works"
        exceptions_app = nil
      end

      if exceptions_app.nil?
        raise ArgumentError, "You need to pass an exceptions_app when initializing ActionDispatch::ShowExceptions. "            "In case you want to render pages from a public path, you can use ActionDispatch::PublicExceptions.new('path/to/public')"
      end

      @app = app
      @exceptions_app = exceptions_app
    end
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