Да, надо было вставить.


map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}

upstream tornado {
hash $arg_key;

server 127.0.0.1:9995;
server 127.0.0.1:9996;
server 127.0.0.1:9997;
server 127.0.0.1:9998;
server 127.0.0.1:9999;
}

server {
listen 8080 default_server;

access_log /var/log/nginx/nginx-access.log;
error_log /var/log/nginx/nginx-error.log;

location /ws/ {
proxy_pass http://tornado;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
}

}