write
def write(self, chunk):
"""Writes the given chunk to the output buffer.
To write the output to the network, use the flush() method below.
If the given chunk is a dictionary, we write it as JSON and set
the Content-Type of the response to be ``application/json``.
(if you want to send JSON as a different ``Content-Type``, call
set_header *after* calling write()).
Note that lists are not converted to JSON because of a potential
cross-site security vulnerability. All JSON output should be
wrapped in a dictionary. More details at
http://haacked.com/archive/2009/06/25/json-hijacking.aspx/ and
https://github.com/facebook/tornado/issues/1009
"""
pass
将chunk数据写到输出缓冲区。
缓冲区数据刷新到浏览器是由socket来控制。
缓冲区刷新的几种方式：
- 程序结束
- 手动刷新
- 缓冲区满了
- 遇到\n
示例：
class DocHandler(RequestHandler):
def get(self, document_id, *args, **kwargs):
self.write(chunk=document_id)
self.write("\r\n")
self.write(chunk={'a': 1, 'b': 2}) # 利用write方法写json数据
finish
刷新缓冲区，关闭当次请求通道
不要在finish下边write
