Forgot to clarify a bit why this is removed. My bad.

In Go, it's not possible to override the `Host` header on [Request](http://golang.org/pkg/net/http/#Request). What I observed was I set the Host header before sending the request and on the server it receives nothing for this header. We also sort of test the host name in the assertion as well, e.g., https://github.com/github/hub/blob/fork_compat/features/fork.feature#L131.

An alternative to this problem is set a custom header and assert in the test server, say `X-HUB-HOST`.