Package Control proxy connection header error

Traceback

Package Control: Fetching list of available packages
  Platform: linux-x64
  Sublime Text Version: 3047
  Package Control Version: 2.0.0-alpha7
theme loaded
Package Control: Unable to find a sublime-package file for SublimeGit
Package Control: Unable to find file package-metadata.json in the package SublimeGit
Package Control: Download Debug
  URL: http://release.sublimegit.net/SublimeGit.sublime-package
  Resolved IP: 192.155.92.235
  Timeout: 30
Package Control: Urllib Debug Proxy
  http_proxy: 
  https_proxy: 
  proxy_username: 
  proxy_password: 
Package Control: Urllib HTTP Debug General
  Connecting to release.sublimegit.net on port 80
Package Control: Urllib HTTP Debug Write
  GET /SublimeGit.sublime-package HTTP/1.1
  Accept-Encoding: gzip,deflate
  User-Agent: Sublime Package Control v2.0.0-alpha7
  Connection: Keep-Alive
  Host: release.sublimegit.net
Package Control: Urllib HTTP Debug Read
  HTTP/1.1 200 OK
  Server: nginx/1.4.0
  Date: Tue, 09 Jul 2013 20:21:33 GMT
  Content-Type: application/octet-stream
  Content-Length: 438818
  Last-Modified: Tue, 09 Jul 2013 19:40:51 GMT
  ETag: "51dc6743-6b222"
  Accept-Ranges: bytes
  Age: 159
  X-Cache: HIT from gcb.bascom.net
Exception in thread Thread-6:
Traceback (most recent call last):
  File "X/threading.py", line 639, in _bootstrap_inner
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/package_installer.py", line 241, in run
    self.result = self.manager.install_package(self.package)
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/package_manager.py", line 489, in install_package
    package_bytes = download_manager.fetch(url, 'Error downloading package.')
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/download_manager.py", line 180, in fetch
    return self.downloader.download(url, error_message, timeout, 3, prefer_cached)
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/downloaders/urllib_downloader.py", line 113, in download
    http_file = self.opener.open(request, timeout=timeout)
  File "X/urllib/request.py", line 473, in open
  File "X/urllib/request.py", line 491, in _open
  File "X/urllib/request.py", line 451, in _call_chain
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/http/debuggable_http_handler.py", line 35, in http_open
    return self.do_open(http_class_wrapper, req)
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/http/persistent_handler.py", line 94, in do_open
    if r.is_keep_alive():
  File "/home/louisc/.config/sublime-text-3/Packages/Package Control/package_control/http/debuggable_http_response.py", line 58, in is_keep_alive
    if connection.lower() == 'keep-alive':
AttributeError: 'NoneType' object has no attribute 'lower'