First, the definition
1. check front and rear ends are not separated from the case:
Front page to see the effect is controlled by the back-end, back-end rendering a page or redirect, which is the need to control the back end of the front display
2. The front end of the separation
Return data required for the rear end of the front end, no longer render the HTML pages, no control effect of the front end. As for front-end user to see what effect the requested data from the back end to the front end of how to load, to determine their own by the front-end, web pages there are treatments, there are App App of the treatment, but either the front end, the required data basically the same, only to develop a back-end logic can provide external data.
