 I can not connect again (ERR_EMPTY_RESPONSE)

First of all, thank you for all the work. Only one device can access the camera at a time. I often have the problem that if I just put down the browser I can not connect again (ERR_EMPTY_RESPONSE). Would it be possible to add a button with "disconnect"?
My second concern, a switch that the LED with set brightness only turns on when a picture or stream is made.
Thanks a lot