can auto grow 00 and 01 replication volumes

weed-fs/src/pkg/util/post.go

@@ -7,17 +7,17 @@ import (
 	"net/url"
 )
 
-func Post(url string, values url.Values) []byte {
+func Post(url string, values url.Values) ([]byte, error) {
 	r, err := http.PostForm(url, values)
 	if err != nil {
 		log.Println("post:", err)
-		return nil
+		return nil, err
 	}
 	defer r.Body.Close()
 	b, err := ioutil.ReadAll(r.Body)
 	if err != nil {
 		log.Println("post:", err)
-		return nil
+		return nil, err
 	}
-	return b
+	return b, nil
 }