Set http status after modifying response headers.

go/weed/weed_server/master_server.go

@@ -1,6 +1,7 @@
 package weed_server
 
 import (
+	"fmt"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
@@ -103,7 +104,8 @@ func (ms *MasterServer) proxyToLeader(f func(w http.ResponseWriter, r *http.Requ
 			defer func() { <-ms.bounedLeaderChan }()
 			targetUrl, err := url.Parse("http://" + ms.Topo.RaftServer.Leader())
 			if err != nil {
-				writeJsonQuiet(w, r, map[string]interface{}{"error": "Leader URL http://" + ms.Topo.RaftServer.Leader() + " Parse Error " + err.Error()})
+				writeJsonError(w, r, http.StatusInternalServerError,
+					fmt.Errorf("Leader URL http://%s Parse Error: %v", ms.Topo.RaftServer.Leader(), err))
 				return
 			}
 			glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader())