allow error responses when proxying

pkg/proxy/remotehost.go

@@ -171,15 +171,14 @@ func (h *RemoteHost) Proxy(id uint64, w http.ResponseWriter, r *http.Request) (b
 		}
 	}
 	w.Header().Set("X-Cart-Owner-Routed", "true")
-	if res.StatusCode >= 200 && res.StatusCode <= 299 {
-		w.WriteHeader(res.StatusCode)
-		_, copyErr := io.Copy(w, res.Body)
-		if copyErr != nil {
-			return true, copyErr
-		}
-		return true, nil
+
+	w.WriteHeader(res.StatusCode)
+	_, copyErr := io.Copy(w, res.Body)
+	if copyErr != nil {
+		return true, copyErr
 	}
-	return false, fmt.Errorf("proxy response status %d", res.StatusCode)
+	return true, nil
+
 }
 
 func (r *RemoteHost) IsHealthy() bool {