configuring rewrite rules in nginx

Question

I have ngnix webserver running on port 80. I have a Nodejs running on 9000 port. I need to rewrite the request coming from my nginx to app server which is running on port 3000.

I tried configuring with below options but it is redirecting to the browser and not forwarding to the app server. When there is a request for /hosts.json it need to be redirected to http://appserver.corp.cn.com:3000/hosts/hosts.json . Please let me know where I am going wrong.

server {
listen       80;
server_name  localhost;
access_log  /var/log/nginx/localhost.access.log;
location / {
             rewrite ^/hosts.json http://appserver.corp.cn.com:3000/hosts.json permanent;
             rewrite ^/hosts/bu.json http://appserver.corp.cn.com:3000/hosts/bu.json permanent;
             proxy_pass http://localhost:9000;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection 'upgrade';
             proxy_set_header Host $host;
             proxy_cache_bypass $http_upgrade;
    }
}

I need to set proxy_pass for the below url pattern

location  ~ ^/hosts/bu/(.*)/app/(.*)$ {
  proxy_pass   http://appserver.cnma.com:3000/hosts/bu/$1/app/$2;
}

Answer 1

You want to proxy to different servers based on URI. There is a natural way for this, just out different proxy_pass directives in appropriate location s:

server {
  ...

  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection 'upgrade';
  proxy_set_header Host $host;
  proxy_cache_bypass $http_upgrade;

  location / {
    proxy_pass http://localhost:9000;
  }

  location /hosts.json {
    proxy_pass http://appserver.corp.cn.com:3000;
  }

  location /hosts/bu.json {
    proxy_pass http://appserver.corp.cn.com:3000;
  }

  location /hosts/bu/ {
    proxy_pass http://appserver.corp.cn.com:3000;
  }
}