Merge branch 'custom-header' into 'master'

Use our own header instead of User-Agent

This will still help routing in HTTP proxies, while also allowing
gitlab-rails to see the User-Agent.

See merge request !6

githandler.go

@@ -153,9 +153,9 @@ func (h *gitHandler) doAuthRequest(r *http.Request) (result *http.Response, err
 	// This allows the Host header received by the backend to be consistent with other
 	// requests not going through gitlab-git-http-server.
 	authReq.Host = r.Host
-	// Set custom user agent for the request. This can be used in some
+	// Set a custom header for the request. This can be used in some
 	// configurations (Passenger) to solve auth request routing problems.
-	authReq.Header.Set("User-Agent", "gitlab-git-http-server")
+	authReq.Header.Set("GitLab-Git-HTTP-Server", Version)
 	return h.httpClient.Do(authReq)
 }