[Bug 1412545] [NEW] proxy isn't used after a dropped connection

[Stratos Moros]

Public bug reported:

Ubuntu version: Ubuntu 14.04.1 LTS
python-urllib3 version: 1.7.1-1build1

Steps to reproduce:

1. set up an http proxy
2. configure a ProxyManager to use said http proxy
3. make successive GET requests to https://pypi.python.org/ 

example script: https://gist.github.com/stratoukos/7545c5c909fa9b5d1cfb

What happens:

urllib3 stops using the http proxy after the connection is dropped
(after 24 requests in my testing with pypi. other people have seen
different numbers)

What I expected to happen:

urllib3 should always use the proxy

Other Info:

This has been fixed in commit 1c30a1f3 of urllib3 and included in its
1.8.3 release. This bug also affects pip and requests as reported here:
https://github.com/pypa/pip/issues/1805

I really hope the bugfix will be backported, since pip is currently
unusable behind an outgoing firewall on 14.04

** Affects: python-urllib3 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1412545

Title:
  proxy isn't used after a dropped connection

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