Urllib2 user-agent header added by an opener is "frozen"

[derdoener]

BPO	1595365
Nosy	@orsenthil, @devdanzin
Files	header-bug.txt: Sample output showing the problem

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/orsenthil'
closed_at = <Date 2010-09-27.01:41:28.417>
created_at = <Date 2006-11-13.02:27:55.000>
labels = ['type-bug', 'library']
title = 'Urllib2 user-agent header added by an opener is "frozen"'
updated_at = <Date 2010-09-27.01:41:28.416>
user = 'https://bugs.python.org/derdoener'

bugs.python.org fields:

activity = <Date 2010-09-27.01:41:28.416>
actor = 'orsenthil'
assignee = 'orsenthil'
closed = True
closed_date = <Date 2010-09-27.01:41:28.417>
closer = 'orsenthil'
components = ['Library (Lib)']
creation = <Date 2006-11-13.02:27:55.000>
creator = 'der_doener'
dependencies = []
files = ['2212']
hgrepos = []
issue_num = 1595365
keywords = ['patch']
message_count = 5.0
messages = ['30531', '86315', '116182', '117126', '117435']
nosy_count = 4.0
nosy_names = ['orsenthil', 'der_doener', 'ajaksu2', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1595365'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2']

[derdoener]

If a Request object gets an User-agent header added by
an opener, that header seems to be "frozen". Although
header_items() shows the changed header, the request
still uses the old one. This does not happen if the
header is set before the request is passed to the
opener, i.e. when the header is not set automatically,
subsequent changes are respected.

I'm using Python 2.4.4 from Debian's sid.

[devdanzin]

Confirmed in trunk.

Easier to copy and paste:

import urllib2
h = urllib2.HTTPHandler(debuglevel = 1)
opener = urllib2.build_opener(h)

request = urllib2.Request('http://www.google.de/')
request.header_items()

opener.open(request)
request.header_items()

request.add_header('User-agent', 'Buggy')
request.header_items()

opener.open(request)

[BreamoreBoy]

What is the status of this issue?

[orsenthil]

This is still a valid bug.

[orsenthil]

Fixed in r85025 (py3k), r85026 (release31-maint) and r85027 (release27-maint).