Nginx's approach to domain name rewriting and general domain name resolution configuration

This paper introduces the methods of domain name rewriting and generic domain name resolution configuration of Nginx and shares them with you. The details are as follows:

#user nobody;
worker_processes 1;
 
#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;
 
 #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;
 
 # Set to allow content to be published as 8M
 client_max_body_size 20M;
 client_body_buffer_size 512k;
 
 add_header Access-Control-Allow-Origin *; 
 add_header Access-Control-Allow-Headers X-Requested-With; 
 add_header Access-Control-Allow-Methods GET,POST,OPTIONS; 
 
 server { 
 listen  80; 
 server_name www.xxx.com; 
 location / { 
 proxy_pass http://127.0.0.1:8080; 
 proxy_set_header Host $host; 
 proxy_set_header X-Real-IP $remote_addr; 
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
 } 
 }
 
 server { 
 listen  80; 
 server_name www.aaa.com; 
 location / { 
 proxy_pass http://127.0.0.1:9989; 
 proxy_set_header Host $host; 
 proxy_set_header X-Real-IP $remote_addr; 
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
 } 
 }
 
 
 # Generic domain name resolution 
 server { 
 listen  80; 
 server_name *.web.yuyuyun.cn; 
 location / { 
 #  Start configuring generic domain names 
 if ( $host ~* (.*)\.(.*)\.(.*)\.(.*) ) {
 set $domain $1; # Get the current   Domain name prefix 
 }
 proxy_pass http://127.0.0.1:1119/$domain/; 
 proxy_set_header Host $host; 
 proxy_set_header X-Real-IP $remote_addr; 
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
 } 
 
 } 
 
}