Reducing the reverse proxy connection time can solve this problem.
server {
listen 80;
server_name 127.0.0.1;
#charset koi8-r;
#access_log logs/host.access.log main;
location /{
proxy_pass http://paila;
proxy_redirect off ;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header
client_body_buffer_size 256k;
proxy_connect_timeout 1;
proxy_send_timeout 30 ;
proxy_read_timeout 60;
proxy_buffer_size 256k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_next_upstream error timeout invalid_header http_500 http _503 http_404;
proxy_max_temp_file_size 128m;
}