# File lib/rack/showexceptions.rb, line 23
    def call(env)
      @app.call(env)
    rescue StandardError, LoadError, SyntaxError => e
      exception_string = dump_exception(e)

      env["rack.errors"].puts(exception_string)
      env["rack.errors"].flush

      if accepts_html?(env)
        content_type = "text/html"
        body = pretty(env, e)
      else
        content_type = "text/plain"
        body = exception_string
      end

      [
        500,
        {
          CONTENT_TYPE => content_type,
          CONTENT_LENGTH => Rack::Utils.bytesize(body).to_s,
        },
        [body],
      ]
    end