kennethreitz/requests — pull request #1500 by gavrie (2013-07-29 08:32:49+00:00)
Title: Update urllib3 to d89d508

This fixes a bug in urllib3 that caused the Host header to be set incorrectly when a proxy is used together with a nonstandard port number.

For example, when going to http://example.com:8000/ through a proxy, the Host header was set to 'example.com' instead of 'example.com:8000' which totally breaks Requests in such a case.