[New-bugs-announce] [issue8843] urllib2 Digest Authorization uri must match request URI

Andrew Nelis report at bugs.python.org
Fri May 28 13:33:18 CEST 2010

New submission from Andrew Nelis <andrew.nelis at gmail.com>:

When using Digest authentication to authenticate with a web server, according to rfc2617 (section the uri in the Authorization header MUST match the request URI.

urllib2.AbstractDigestAuthHandler doesn't honour this when we request a url of the form 'http://hostname' without the trailing slash and we end up with request headers of the form:

GET / 1.1
Authorization: Digest ... uri="" <- should be uri="/"!

A web server will return 400 Bad Request error.

I attach a patch to fix urllib2.AbstractDigestAuthHandler.get_authorization that simply checks for the empty uri and uses '/' instead. It's the same thing that httplib.HTTPConnection does when it builds the GET line.

However I do wonder if this uri normalisation should be part of Request.get_selector?

Following is a script to demonstrate the behaviour, if you call it as:

./do_digest_request.py http://myserver username password

(and assuming myserver is using Digest authentication) there will a 400 response instead of it working.

--- do_digest_request.py
#!/usr/bin/env python

import sys
import urllib2
import urlparse

def request( url, username, password ):

    p = urlparse.urlparse( url )
    password_manager = urllib2.HTTPPasswordMgrWithDefaultRealm()
    password_manager.add_password( None, p.hostname, username, password )

    handlers = [
        urllib2.HTTPDigestAuthHandler( password_manager ),

    opener = urllib2.build_opener( *handlers )
    request = urllib2.Request( url )
    response = opener.open( request )

if __name__ == '__main__':
    request( sys.argv[1], sys.argv[2], sys.argv[3] )

components: Library (Lib)
files: urllib2.diff
keywords: patch
messages: 106649
nosy: anelis
priority: normal
severity: normal
status: open
title: urllib2 Digest Authorization uri must match request URI
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file17480/urllib2.diff

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