REST describes a form of interaction between a client and a server on a network. REST itself is not useful, but how to design RESTful apis (RESTful Web interfaces).

Now that we’re going to design RESTful apis, let’s take a look at what non-restful apis look like. Tornado

import os
import tornado.web
import tornado.ioloop

class AddHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello , ADD\n")
    
class DeleteHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello , DELETE\n")

class UpdateHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello , UPDATE\n")

class SelectHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello , SELECT\n")


if __name__ == "__main__":
    settings = {
        'debug' : True,
        'static_path' : os.path.join(os.path.dirname(__file__) , "static") ,
        'template_path' : os.path.join(os.path.dirname(__file__) , "template") ,
    }

    application = tornado.web.Application([
        (r"/add" , AddHandler),
        (r"/delete" , DeleteHandler),
        (r"/update" , UpdateHandler),
        (r"/select" , SelectHandler),

    ] , **settings)
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()
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As above, it is not RESTful to define 4 routes to implement the function of add, delete, modify and search. The RESTful API looks something like this:

import os
import tornado.web
import tornado.ioloop

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello , SELECT\n")
    
    def post(self):
        self.write("hello , ADD\n")
    
    def put(self):
        self.write("hello , UPDATE\n")

    def delete(self):
        self.write("hello , DELETE\n")


if __name__ == "__main__":
    settings = {
        'debug' : True,
        'static_path' : os.path.join(os.path.dirname(__file__) , "static") ,
        'template_path' : os.path.join(os.path.dirname(__file__) , "template") ,
    }

    application = tornado.web.Application([
        (r"/" , MainHandler),
    ] , **settings)
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()
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It just defines one API to do different things with different requests, so it’s RESTful