fix some typos and add basic nginx authentication doc

site/src/site/sphinx/en/web-console.md

@@ -1,11 +1,87 @@
 Web Console
-===
+===========
 
-Arthas supports the Web Console. After attach success, the user can access: [http://localhost:8563/](http://localhost:8563/).
+### You should know
 
-The user can fill in the IP and connect the remote arthas on other machines.
+Arthas supports Web Console. When being attached successfully, users can access it at: [http://localhost:8563/](http://localhost:8563/).
+
+Users can fill up the IP and port to connect to the remote Arthas as:
 
 ![web console](_static/web-console-local.png)
 
+### Basic Authentication 
+
+We can turn to reversed proxy (Nginx) to add basic authentication to ensure security. This can be easily achieved in Unix/Linux/Mac. Take Ubuntu 16.04 as an example:
+
+#### Install apache2-utils
+
+```
+sudo apt-get install apache2 apache2-doc apache2-utils
+
+# if it's necessary, update and upgrade repositories
+sudo apt-get update && sudo apt-get upgrade
+```
+
+#### Create some accounts
+
+```
+sudo htpasswd -c /etc/apache2/.htpasswd user1
+# you will be prompted to enter the password here
+
+# encoded password stored
+$ cat /etc/apache2/.htpasswd
+user1:$apr1$/woC1jnP$KAh0SsVn5qeSMjTtn0E9Q0
+
+# add another user, no need to use -c option here again
+sudo htpasswd /etc/apache2/.htpasswd user2
+```
+
+#### Configure Nginx
+
+```
+$ cat /etc/nginx/conf.d/arthas.conf 
+
+# after being authenticated, redirected to the proper address
+server {
+  # testing in the same host, use another port to listen;
+  listen 8564;
+
+  auth_basic "Administrator Area";
+  auth_basic_user_file /etc/apache2/.htpasswd;
+
+  location / {
+    # after being authenticated, redirect the request to arthas at port: 8563;
+    proxy_pass http://localhost:8563/;
+  }
+}
+```
+
+Remember to configure `/etc/nginx/nginx.conf` to include it as
+
+```
+$ cat /etc/nginx/nginx.conf 
+
+# ...
+
+http {
+    # to include the newly added configuration;
+    include /etc/nginx/conf.d/*.conf;
+    # ...
+}
+```
+
+Restart Nginx: `sudo service nginx restart`; if there is anything wrong, please check `tail -f -n 100 /var/log/nginx/error.log`.
+
+### Test
+
+```
+
+# start Arthas
+
+$ bin/as.sh
+```
+
+Access [http://localhost:8564](http://localhost:8564) now. 
+
 
-If you have suggestions for the Web Console, please leave a message here: [https://github.com/alibaba/arthas/issues/15](https://github.com/alibaba/arthas/issues/15)
+If you have suggestions for the Web Console, please leave a message here: [https://github.com/alibaba/arthas/issues/15](https://github.com/alibaba/arthas/issues/15)