anchor.diff:  
   ### Send message to users [/chat/public]
   
  -The **Server** will send message to the users through this api.
  -
   ### Receive message from server [GET]
   
   + Attributes
  
positive.code: 
  ### Get userId from Server [/chat/register/{sessionId}]
  
  **Server** will send the `userId` to **User** through this API. After **User** send `username` to **Server**
  
  + Parameters
      + sessionId: 1441428112793 (required, string) - The current sessionId of the user
  
  
negative.code: ### Send message to server [/chat/public/server]
  
  Due to the structure of **Faye**, we have to use **another** channel to transfer message from Client to Server.
  
  > **Note:** a channel must have a **single responsibility** to maintain the **stability** of the application.
  >
  > A channel will be a **publisher** or **subscriber**.
  