SSE Test
Server_Sent_Event Test.
Server_URL:
Setup
Ex: https://localhost/serv_sse_1, https://localhost:4434/serv_sse_1,
https://sau.hopto.org/serv_sse_1, https://sau.hopto.org:4434/serv_sse_2,
or what_ever_server_you_have ...