+----> google/youtube
                             +----------------+  |
                             |                |  |
user browser +-------------->+ siteproxy      +-------> wikipedia
                             |                |  |
                             +----------------+  |
                                                 +----> chinese forums

 1. user browser url: https://siteproxy.herokuapp.com/https/www.google.com
 2. siteproxy.herokuapp.com received the url and request www.google.com, and get response from www.google.com
 3. siteproxy replace all returned strings in javascript/html:
    https://www.google.com => https://siteproxy.herokuapp.com/https/www.google.com
    url(/https/github.com/xxx) => url(/https/github.com/https/www.google.com/xxx)
    https://xxx => https://siteproxy.herokuapp.com/https/xxx
    etc.
 4. send back the modified html/javascript to user browser.

1. www.google.com, and search action.
2. www.youtube.com, only firefox browser is supported.
3. zh.wikipedia.org, and search action.
4. facebook, login is not verified.
5. other websites.

1. register one now.sh account from https://zeit.co/home
2. npm install -g now
3. git clone https://github.com/netptop/siteproxy.git
4. cd siteproxy
5. now
6. find your domain name from now cli, then replace serverName in 'config.js', like:
   serverName: 'siteproxy.herokuapp.com' ====> 'your-domain-name.now.sh'
7. change "blockedSites = ['www.youtube.com', 'm.youtube.com']" ====> "blockedSites = []" if you want to support youtube
8. now --prod
9. done

1. create ssl website(using certbot and nginx), and configure nginx as follow:
   vi /etc/nginx/sites-available/default:
   ...
   server {
      server_name siteproxy.your.domain.name
      location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_pass       http://127.0.0.1:8011;
      }
   }
2. systecmctl start nginx
3. npm install -g forever
4. cd siteproxy
5. find your domain name from now cli, then replace serverName in 'config.js', like:
   serverName: 'siteproxy.herokuapp.com' ====> 'siteproxy.your.domain.name'
6. change "blockedSites = ['www.youtube.com', 'm.youtube.com']" ====> "blockedSites = []" if you want to support youtube
7. forever start -c 'node --tls-min-v1.0' index.js
8. done