Python的龍捲風流請求體

Question

文檔（http://www.tornadoweb.org/en/stable/web.html#tornado.web.stream_request_body）是writen是 There is a subtle interaction between data_received and asynchronous prepare: The first call to data_received may occur at any point after the call to prepare has returned or yielded. 但如果我嘗試

@tornado.web.stream_request_body 
class HTTPHandler(tornado.web.RequestHandler): 
    @tornado.gen.coroutine 
    def prepare(self): 
     yield long_time_operation() 

    @tornado.gen.coroutine 
    def data_received(self, chunk): 
     print("Data received") 

DATA_RECEIVED不叫之前準備返回（不會產生）。爲什麼？

Answer 1

似乎文檔是錯誤的，我已經提交了一個錯誤。

https://github.com/tornadoweb/tornado/issues/1933