When using nginx as a reverse proxy, you can simply forward the request directly to the next service as is. Setting a proxy_pass request will only replace the domain name, if you want to access different services based on different url suffixes, you need to go through the following method.
options 1: Add “/”
server {
    listen              8000;
    server_name         abc.com;
    access_log  "pipe:rollback /data/log/nginx/access.log interval=1d baknum=7 maxsize=1G"  main;
    location ^~/user/ {
        proxy_set_header Host $host;
        proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://user/;
    }
    location ^~/order/ {
        proxy_set_header Host $host;
        proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://order/;
    }
}^~/user/ matches requests prefixed with user, and proxy_pass ends with /, then the path after /user/* is spliced directly to the end, i.e. user is removed.
options 2: rewrite
upstream user {
  server localhost:8089 weight=5;
}
upstream order {
  server localhost:8090 weight=5;
}
server {
    listen              80;
    server_name  abc.com;
    access_log  "pipe:rollback /data/log/nginx/access.log interval=1d baknum=7 maxsize=1G"  main;
    location ^~/user/ {
        proxy_set_header Host $host;
        proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        rewrite ^/user/(.*)$ /$1 break;
        proxy_pass http://user;
    }
    location ^~/order/ {
        proxy_set_header Host $host;
        proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        rewrite ^/order/(.*)$ /$1 break;
        proxy_pass http://order;
    }
}proxy_pass does not have / at the end, and rewrite rewrites the url.