How to solve nginx 503 Service Temporarily Unavailable error

Recently, the 503 service temporarily unavailable error often appears after the website is refreshed. Sometimes it is possible. I think of the recent restriction on the number of single IP visits in nginx.conf (limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s; ) After enlarging this number and refreshing, the problem is solved. (I also changed this to a larger limit_req zone=allips burst=50 nodelay; ) In order to confirm the problem, I repeatedly changed the number and tested it and found that the problem is indeed here. There is a problem if this number is set too small. I found through fiddler that the web page needs to be refreshed because the js, css, and images referenced on the page are all counted as one connection. Therefore, this limit may be exceeded with a single page refresh. If this limit is exceeded, a 503 service temporarily unavailable message will be displayed.

Attach nginx.conf

#user nobody;
worker_processes 1;
#worker_rlimit_nofile 100000; 
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
 
#pid    logs/nginx.pid;
 
events {
  worker_connections 1024;
}
 
http {
  include    mime.types;
  default_type application/octet-stream;
 
##cache##
 proxy_connect_timeout 5;
 proxy_read_timeout 60;
 proxy_send_timeout 5;
 proxy_buffer_size 16k;
 proxy_buffers 4 64k;
 proxy_busy_buffers_size 128k;
 proxy_temp_file_write_size 128k;
 proxy_temp_path /home/temp_dir;
 proxy_cache_path /usr/local/nginx/cache levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;
 ##end##
#limit per ip per second access times 10 
limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;
 
  #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 logs/access.log main;
 
  sendfile    on;
  #tcp_nopush   on;
 
  #keepalive_timeout 0;
  keepalive_timeout 65;
 
  #gzip on;
upstream myweb80{
  ip_hash;
  server 192.168.3.105:80;
  server 192.168.3.103:80;
}
 
upstream myweb8080{
  ip_hash;
  server 192.168.3.222:10080;
  #server 192.168.3.103:8080;
 } 
upstream myweb10086{
  ip_hash;
  server 192.168.3.102:10086;
  server 192.168.3.108:10086;
 } 
upstream myweb443{
  ip_hash;
  server 192.168.3.105:443;
  server 192.168.3.103:443;
 } 
 
  # another virtual host using mix of ip-, name-, and port-based configuration
  #
  server {
    listen    80;
    allow  218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
deny  all;
server_name myweb.com;
    location / {
        proxy_pass http://myweb80;
proxy_set_header x-real-ip $remote_addr;
limit_req zone=allips burst=50 nodelay;  
    }
  }
 
  server {
    listen    8080;
allow  218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
deny  all;
    location / {
        proxy_pass http://myweb8080;
proxy_set_header x-real-ip $remote_addr;
limit_req zone=allips burst=50 nodelay;  
    }
  }
 
# https server
  #
  server {
    listen    10086 ssl;
    server_name localhost;
allow  218.17.158.2;
allow 127.0.0.0/24;
allow 192.168.0.0/16;
allow 58.251.130.1;
allow 183.239.167.3;
allow 61.145.164.1;
#deny  all;
    ssl_certificate   ssl/1_www.myweb.com_bundle.crt;
    ssl_certificate_key ssl/2_www.myweb.com.key;
 
  #  ssl_session_cache  shared:ssl:1m;
  #  ssl_session_timeout 5m;
 
  #  ssl_ciphers high:!anull:!md5;
  #  ssl_prefer_server_ciphers on;
 
    location / { 
   proxy_pass https：// myweb10086; 
   #roft html; 
   #index index.html index.htm; 
    } 
  }
 
  服务器{ 
    listen 443 ssl; 
    server_name localhost;
 
    ssl_certificate ssl / 1_www.myweb.com_bundle.crt; 
    ssl_certificate_key ssl / 2_www.myweb.com.key;
 
  #ssl_session_cache共享：ssl：1m; 
  #ssl_session_timeout 5m;
 
  #ssl_ciphers high：！anull：！md5; 
  #ssl_prefer_server_ciphers on;
 
    location / { 
   proxy_pass https：// myweb443; 
   #roft html; 
   #roft html; 
   #index index.html index.htm; 
    } 
  } 
}

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