cpp-netlib/cpp-netlib — pull request #409 by leecoder (2014-07-01 05:59:44+00:00)
Title: Fix to overwrite connection header

Sometimes, the default value of connection header can be needed to change.

For example, [http_client.cpp:64](https://github.com/cpp-netlib/cpp-netlib/blob/0.11-devel/libs/network/example/http_client.cpp#L64) has used lowercase "close".