wrappers.py 文件源码

def get_app_iter(self, environ):
        """Returns the application iterator for the given environ.  Depending
        on the request method and the current status code the return value
        might be an empty response rather than the one from the response.

        If the request method is `HEAD` or the status code is in a range
        where the HTTP specification requires an empty response, an empty
        iterable is returned.

        .. versionadded:: 0.6

        :param environ: the WSGI environment of the request.
        :return: a response iterable.
        """
        status = self.status_code
        if environ['REQUEST_METHOD'] == 'HEAD' or \
           100 <= status < 200 or status in (204, 304):
            iterable = ()
        elif self.direct_passthrough:
            if __debug__:
                _warn_if_string(self.response)
            return self.response
        else:
            iterable = self.iter_encoded()
        return ClosingIterator(iterable, self.close)