# File lib/rack/showexceptions.rb, line 23
    def call(env)
      @app.call(env)
    rescue StandardError, LoadError, SyntaxError => e
      backtrace = pretty(env, e)
      [500,
       {"Content-Type" => "text/html",
        "Content-Length" => backtrace.join.size.to_s},
       backtrace]
    end