upstream backend { #### server 127.0.0.1:8080; #### #check interval=3000 rise=2 fall=5 timeout=1000 type=http; #check_http_send "GET /apache_router.jsp HTTP/1.0\r\n\r\n"; #check_http_send "GET / HTTP/1.0\r\n\r\n"; #check_http_expect_alive http_2xx http_3xx; #keepalive 32; }