nginx如何通过proxy_pass设置反向代理,隐藏端口号

server
    {
        listen 80;
        server_name www.xxx.com;
 
        server_name_in_redirect off;
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
        
        location / {
            proxy_pass http://www.xxx.com:8978;
        }
    }

location /proxy {
	proxy_pass http://127.0.0.1:8099/svr1;  # uri为'/svr1'
}

location /proxy2 {
	proxy_pass http://127.0.0.1:8099;  # 无uri
}

server {
   listen       80;
   server_name  localhost;
 
   location /api1/ {
           proxy_pass http://localhost:8080;
        }
   # http://localhost/api1/xxx -> http://localhost:8080/api1/xxx
 
 
   location /api2/ {
           proxy_pass http://localhost:8080/;
        }
   # http://localhost/api2/xxx -> http://localhost:8080/xxx
 
 
   location /api3 {
           proxy_pass http://localhost:8080;
        }
   # http://localhost/api3/xxx -> http://localhost:8080/api3/xxx
 
 
   location /api4 {
           proxy_pass http://localhost:8080/;
        }
   # http://localhost/api4/xxx -> http://localhost:8080//xxx，请注意这里的双斜线，好好分析一下。
 
 
   location /api5/ {
           proxy_pass http://localhost:8080/haha;
        }
   # http://localhost/api5/xxx -> http://localhost:8080/hahaxxx，请注意这里的haha和xxx之间没有斜杠，分析一下原因。
 
   location /api6/ {
           proxy_pass http://localhost:8080/haha/;
        }
   # http://localhost/api6/xxx -> http://localhost:8080/haha/xxx
 
   location /api7 {
           proxy_pass http://localhost:8080/haha;
        }
   # http://localhost/api7/xxx -> http://localhost:8080/haha/xxx
 
   location /api8 {
           proxy_pass http://localhost:8080/haha/;
        }
  # http://localhost/api8/xxx -> http://localhost:8080/haha//xxx，请注意这里的双斜杠。
}