服务器发送的事件听众没有被击中？

I just started using SSE, and I have it somewhat implemented. I'm able to make a http request to the server, but every response I get is going back to the onmessage function. I can't seem to figure out why my custom listeners aren't being hit. I have a listener for "ping" and a listener for "pong". In my python script I have two events set... One for "ping", and the other for "pong". What am I missing?I just started using SSE, and I have it somewha