Restfull switch "is_on_template"


I’m trying to make a restfull switch in home assistant to controll an esp8266 device which is sending IR commands.
The problem is i cant make homeassistant recognize the state of the switch which results in it instantly turns off and sends the command two times.

My esp8266 code ends with this:

client.println(“Content-Type: text/html”);
client.println("<""!DOCTYPE HTML>");

How do i configure the “is_on_template” in my switch config to make it recognize the state of the switch?
Or is it necessary to change the code in esp8266 and make it print something else as reply?


use Content-Type: text/plain and just send on or off.