python - urllib2 多个 Set-Cookie header 作为响应

Question

我正在使用 urllib2 与发回多个 Set-Cookie header 的网站进行交互。然而，响应 header 字典只包含一个 - 似乎重复的键正在相互覆盖。

有没有办法用 urllib2 访问重复的 header ？

Answer 1

根据 urllib2 docs ，结果 URL 对象的 .headers 属性是一个 httplib.HTTPMessage(似乎没有记录，至少在 Python 文档中是这样)。

但是，

help(httplib.HTTPMessage)
...

If multiple header fields with the same name occur, they are combined
according to the rules in RFC 2616 sec 4.2:

Appending each subsequent field-value to the first, each separated
by a comma. The order in which header fields with the same field-name
are received is significant to the interpretation of the combined
field value.

因此，如果您访问 u.headers['Set-Cookie']，您应该得到一个 Set-Cookie header ，其值以逗号分隔。

确实如此。

import httplib
from StringIO import StringIO

msg = \
"""Set-Cookie: Foo
Set-Cookie: Bar
Set-Cookie: Baz

This is the message"""

msg = StringIO(msg)

msg = httplib.HTTPMessage(msg)

assert msg['Set-Cookie'] == 'Foo, Bar, Baz'