twitter/finagle — pull request #274 by wozaki (2014-05-30 10:38:28+00:00)
Title: Add Host Header for Apache Proxy Server

I get the following apache error and cannot connect by ClientBuilder#httpProxy when using Apache Proxy Server.
`[error] [client 127.0.0.1] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23)`