    # File lib/yard/server/rack_adapter.rb, line 48
          def call(env)
            request = Rack::Request.new(env)
            request.path_info = unescape(request.path_info) # unescape things like %3F
            router.call(request)
          rescue StandardError => ex
            log.backtrace(ex)
            [500, {'Content-Type' => 'text/plain'},
              [ex.message + "\n" + ex.backtrace.join("\n")]]
          end