HTTP 1.1 Expect标头握手 [英] HTTP 1.1 Expect header handshake

问题描述

根据 http://www.w3.org/Protocols /rfc2616/rfc2616-sec8.html#sec8.2.3 客户端必须等待100（继续）状态，才能进行POST（在需要此标头的HTTP 1.1服务器上）。

According http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.2.3 client has to wait for 100 (Continue) status, before making POST (on HTTP 1.1 server that requires this header).

我无法理解Python如何做到这一点。例如：

I can't understand how can Python do this. For example:

conn = httplib.HTTPConnection(url)
conn.putrequest('POST', page)
conn.putheader(...)
conn.putheader('Expect', '100-continue')
conn.endheaders()

现在，我没有看到其他选项然后发送数据：

Now, I don't see other options then send the data:

conn.send(data)

在这种情况下我收到错误，当要求时响应：

in which case I get error, when asking for response:

error: [Errno 10053] An established connection was aborted by the software in your host machine

我如何要求提供状态100，以便我可以发送数据？

How can I ask for status 100, so that I can send the data?

推荐答案

我认为 httplib 支持这个（非常好）;请参阅此请求票据中的讨论，具体为

I don't think httplib supports this (very well); see the discussion in this requests ticket, specifically

并且可以以破坏httplib的方式提前关闭套接字

and can close the socket early in a way that breaks httplib

该评论，Augie Fackler（durin42）也提到他自己的 httpplus 图书馆。

The author of that comment, Augie Fackler (durin42) also mentions his own httpplus library.

快速浏览源代码显示 it 确实处理的承诺 Expect：100-Continue 正确：

A quick glance at the source code shows promise that it does handle Expect: 100-Continue correctly:

# handle 100-continue response
hdrs, body = self.raw_response.split(self._end_headers, 1)
http_ver, status = hdrs.split(' ', 1)
if status.startswith('100'):
    self.raw_response = body
    self.continued = True
    logger.debug('continue seen, setting body to %r', body)
    return

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