From aa2cef744415688bdc5eeaded86935eefa1a6503 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=AE=8B=E7=A5=9E=E5=AE=97?= <zhijiang.nzj@alibaba-inc.com>
Date: Mon, 3 Aug 2020 14:00:29 +0800
Subject: [PATCH] Fixed RPC Sign (#227)

---
 src/Support/Sign.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Support/Sign.php b/src/Support/Sign.php
index 214319fe..1310d3d4 100644
--- a/src/Support/Sign.php
+++ b/src/Support/Sign.php
@@ -111,6 +111,9 @@ public static function rpcString($method, array $parameters)
         ksort($parameters);
         $canonicalized = '';
         foreach ($parameters as $key => $value) {
+            if ($value === null || $value === '') {
+                continue;
+            }
             $canonicalized .= '&' . self::percentEncode($key) . '=' . self::percentEncode($value);
         }