diff --git a/src/Qiniu/Auth.php b/src/Qiniu/Auth.php
index dc013008..6ba3bb41 100644
--- a/src/Qiniu/Auth.php
+++ b/src/Qiniu/Auth.php
@@ -122,7 +122,9 @@ public function signQiniuAuthorization($urlString, $method = "GET", $body = "",
 
         // append body
         $data .= "\n\n";
-        if (strlen($body) > 0
+        if (
+            !is_null($body) 
+            && strlen($body) > 0
             && isset($headers["Content-Type"])
             && $headers["Content-Type"] != "application/octet-stream"
         ) {
diff --git a/src/Qiniu/Config.php b/src/Qiniu/Config.php
index 5bf413f7..c20b53ab 100644
--- a/src/Qiniu/Config.php
+++ b/src/Qiniu/Config.php
@@ -1,6 +1,7 @@
 <?php
 namespace Qiniu;
 
+#[\AllowDynamicProperties]
 final class Config
 {
     const SDK_VER = '7.6.0';
diff --git a/src/Qiniu/Http/Header.php b/src/Qiniu/Http/Header.php
index 950e171c..d2fa9cf4 100644
--- a/src/Qiniu/Http/Header.php
+++ b/src/Qiniu/Http/Header.php
@@ -111,6 +111,7 @@ public function getRawData()
      *
      * @return boolean
      */
+    #[\ReturnTypeWillChange]
     public function offsetExists($offset)
     {
         $key = self::normalizeKey($offset);
@@ -122,6 +123,7 @@ public function offsetExists($offset)
      *
      * @return string|null
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         $key = self::normalizeKey($offset);
@@ -138,6 +140,7 @@ public function offsetGet($offset)
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($offset, $value)
     {
         $key = self::normalizeKey($offset);
@@ -151,6 +154,7 @@ public function offsetSet($offset, $value)
     /**
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         $key = self::normalizeKey($offset);
@@ -160,6 +164,7 @@ public function offsetUnset($offset)
     /**
      * @return \ArrayIterator
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         $arr = array();
@@ -172,6 +177,7 @@ public function getIterator()
     /**
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function count()
     {
         return count($this->data);