@app.route() 如何注册路由

  源码:
      1 | @app.route("/hello", methods=["GET"])
      2 | def hello(): return "hi"
  注册前 → 后:规则数 1 → 2 | view_functions 数 1 → 2
  装饰器返回的是原函数: hello | callable: True | 类型: function
  Rule 对象:rule = /hello | endpoint = hello | methods = ['GET', 'HEAD', 'OPTIONS'] | strict_slashes = True | view_functions["hello"] is hello: True

  @route 的规则  : [('/x', 'f', ['OPTIONS', 'POST'])]
  add_url_rule : [('/x', 'f', ['OPTIONS', 'POST'])]
  相同: True
  Scaffold.route 里的 decorator(原样):
        def decorator(f: T_route) -> T_route:
            endpoint = options.pop("endpoint", None)
            self.add_url_rule(rule, endpoint, f, **options)
            return f
    
        return decorator

  两个同名函数 → AssertionError: View function mapping is overwriting an existing endpoint function: view
  自定义 endpoint 后 view_functions 的键: ['c_custom', 'static', 'view']

  /one    → ['GET', 'HEAD', 'OPTIONS']
  /three  → ['OPTIONS', 'POST']
  /two    → ['GET', 'HEAD', 'OPTIONS']
  请求: {'/one': 200, '/two': 200, '/three': 405} | POST /three: 200

  AssertionError: The setup method 'get' can no longer be called on the application. It has already handled its first request, any changes will not be applied consistently.

Endpoint  Methods    Rule                   
--------  ---------  -----------------------
items     GET, POST  /items                 
static    GET        /static/<path:filename>
user      GET        /users/<int:uid>