web.py 文件源码

def prepare(self):
        """Called at the beginning of a request before  `get`/`post`/etc.

        Override this method to perform common initialization regardless
        of the request method.

        Asynchronous support: Decorate this method with `.gen.coroutine`
        or `.return_future` to make it asynchronous (the
        `asynchronous` decorator cannot be used on `prepare`).
        If this method returns a `.Future` execution will not proceed
        until the `.Future` is done.

        .. versionadded:: 3.1
           Asynchronous support.
        """
        pass