Hello,

i'm trying to setup a failover configuration between two upstream servers, all works as expected. But i want to cover the case if one of the upstream servers is became a very slow and i want to remove this servers from rotation and move all requests to the second upstream server.

upstream rubyfe {
server qa-vmf01.int:443;
server qa-vmf02.int:443;
}


server {
listen 443 http2;
server_name qa-www.example.com;
gzip on;
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;
send_timeout 300;
proxy_buffering on;
location / {
proxy_read_timeout 1;
proxy_pass https://rubyfe;
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
proxy_next_upstream_timeout 3;
}



when i tried to load the first server
#stress --cpu 80 --io 8 --vm 4 --vm-bytes 300M --timeout 180s

# wrk -t2 -c20 -d30s https://qa-www.example.com

in log files i catched request from "wrk"
192.168.0.1 - - [22/Jun/2018:17:59:10 -0400] "GET / HTTP/1.1" 200 50393 "-" "-" "-" "192.168.0.2:443, 192.168.0.3:443 [ 1.001, 0.814 ]" "text/html; charset=utf-8" "-" "582bd020659715d66afafad533f7ac5d" "TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "



but at this time i tried to get result via "curl" i seen

$ curl -IL https://qa-www.example.com/
HTTP/1.1 502 Bad Gateway



could you help me to understand how i can operate timeouts of requests to the upstream servers and in case if one of the upstream server became is slow to force requests switch to another server