How Nginx dynamically forwards to upstream based on the path in the url

场景1

/svr1/xxxx?yyy 转发到 svr1:8080/xxxx?yyy

/svr2/xxxx?yyy 转发到 svr2:8080/xxxx?yyy

配置如下：

location ~* /(srv[1-9]+)/(.*)$ {
  allow all;
  proxy_pass http://$1/$2$is_args$args; 
  proxy_set_header host $host;                         
  proxy_set_header x-forwarded-for $forwarded_addr;                                
}

upstream srv1 {                                                   
   server srv1-ip:8080;
}
      
upstream srv2 {                                                   
   server srv2-ip:8080;
}

场景2

svc1下有3个对等服务srv1,2,3，/svc1/xxxx?yyy 转发到，srv1/2/3:8080/xxxx?yyy

svc2下有3个对等服务srv4,5,6，/svc2/xxxx?yyy 转发到，svr4/5/6:8080/xxxx?yyy

location ~* /(svc[1-9]+)/(.*)$ {                             
  allow all;                                  
  proxy_pass http://$1/$1/$2$is_args$args;                   
  proxy_set_header host $host;
  proxy_set_header x-forwarded-for $forwarded_addr;                   
}

upstream svc1 {
  server srv1:8080;   
  server srv2:8080;   
  server srv3:8080;                
}

upstream svc2 {
  server srv3:8080;   
  server srv4:8080;   
  server srv5:8080;                
}

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