Detailed explanation of Nginx timeout configuration

I recently used nginx in a project, and used Java in the backend. I found that one request took more than 1 minute to process in the backend, and the request Status Code was 504 Gateway Time-out.

Understand all the timeout-related configurations of nginx, as follows:

keepalive_timeout

HTTP has a KeepAlive mode, which tells the webserver to keep the TCP connection open after processing a request. If other requests are received from the client, the server will use this unclosed connection without establishing another connection.

http keep-alive, every request of a web page is HTTP (images, CSS, etc.), and opening an HTTP request requires establishing a TCP connection first. If a page has to open and close a TCP connection for each request, it will be a waste of resources. keepalive_timeout is the time that the TCP connection will remain when an HTTP request is completed. If another HTTP request comes at this time, the TCP connection will be reused. If there is no new request, the TCP connection will be closed.

user nginx;
worker_processes 1;
 
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
 
 
events {
  worker_connections 1024;
}
 
 
http {
  include /etc/nginx/mime.types;
  default_type application/octet-stream;
 
  log_format main '$remote_addr - $remote_user [$time_local] "$request" '
           '$status $body_bytes_sent "$http_referer" '
           '"$http_user_agent" "$http_x_forwarded_for"';
 
  access_log /var/log/nginx/access.log main;
 
  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
 
 
  keepalive_timeout 65;
  client_max_body_size 8192m;
 
  #gzip on;
 
  #include /etc/nginx/conf.d/*.conf;
 
 
 
  server {
 listen 80 so_keepalive=30m::;
 listen 443 default ssl;
 
 ssl_certificate /etc/nginx/ssl/server.crt;
 ssl_certificate_key /etc/nginx/ssl/portalkey.key;
 #ssl_password_file /etc/nginx/ssl/ssl.pass;
 
 
    ssl_session_timeout 5m;
    ssl_protocols SSLv2 SSLv3 TLSv1;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
 
 location / {
 proxy_request_buffering off;
 proxy_pass http://127.0.0.1:8011/;
 proxy_connect_timeout 180;
    proxy_send_timeout 180;
    proxy_read_timeout 180;
    send_timeout 180;
 }
 location /test1_url/ {
 proxy_pass http://127.0.0.1:8008/;
 proxy_connect_timeout 180;
    proxy_send_timeout 180;
    proxy_read_timeout 180;
    send_timeout 180;
 }
 location /test2_url/ {
 proxy_pass http://127.0.0.1:3000/;
 proxy_connect_timeout 180;
    proxy_send_timeout 180;
    proxy_read_timeout 180;
    send_timeout 180;
 }
  }
}

# Configuration section: http, default 75s

keepalive_timeout 60;

• send_timeout: Timeout for sending data to the client, 60s by default. If the client does not receive a byte within 60 consecutive seconds, the connection is closed.
• proxy_connect_timeout: The connection timeout between nginx and the upstream server
• proxy_read_timeout: nginx times out when receiving data from the upstream server, 60s by default. If no byte is received within 60 consecutive seconds, the connection is closed.
• proxy_send_timeout: nginx sends data to the upstream server timeout, 60s by default. If no byte is sent within 60 consecutive seconds, the connection is closed.

so_timeout:

When a user opens a TCP connection with a server --> there is no traffic on this connection for a long time (so_keepalive timeout) --> the server sends a probe packet to see if the user is still alive --> if there is no response to the probe packet, the TCP connection is closed

so_keepalive=on|off|[keepidle]:[keepintvl]:[keepcnt]

so_keepalive=30m::10
  will set the idle timeout (TCP_KEEPIDLE) to 30 minutes, leave the probe interval (TCP_KEEPINTVL) at its system default, and set the probes count (TCP_KEEPCNT) to 10 probes.

Only one of the above three parameters can be used, and they cannot be used at the same time, such as so_keepalive=on, so_keepalive=off or so_keepalive=30s:: (which means waiting for 30 seconds without data packets to send a detection packet)

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.