我正在使用urllib2与与发送回多个Set-Cookie标头的网站进行交互.但是,响应标头字典仅包含一个-似乎重复的键相互覆盖.

有没有办法使用urllib2访问重复的标头？

解决方法:

根据urllib2 docs,结果URL对象的.headers属性是httplib.HTTPMessage(至少在Python文档中似乎没有记录).

然而,

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’],则应该获得一个Set-Cookie标头,其值之间用逗号分隔.

确实,情况确实如此.

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'