httpserver.py 文件源码

def __iter__(self):
        environ = self.environ

        self.path = environ.get('PATH_INFO', '')
        self.client_address = environ.get('REMOTE_ADDR','-'), \
                              environ.get('REMOTE_PORT','-')
        self.command = environ.get('REQUEST_METHOD', '-')

        self.wfile = BytesIO() # for capturing error

        try:
            path = self.translate_path(self.path)
            etag = '"%s"' % os.path.getmtime(path)
            client_etag = environ.get('HTTP_IF_NONE_MATCH')
            self.send_header('ETag', etag)
            if etag == client_etag:
                self.send_response(304, "Not Modified")
                self.start_response(self.status, self.headers)
                raise StopIteration()
        except OSError:
            pass # Probably a 404

        f = self.send_head()
        self.start_response(self.status, self.headers)

        if f:
            block_size = 16 * 1024
            while True:
                buf = f.read(block_size)
                if not buf:
                    break
                yield buf
            f.close()
        else:
            value = self.wfile.getvalue()
            yield value