diff --git a/src/Authentication/Native.php b/src/Authentication/Native.php
index f32e6b9..b41e306 100644
--- a/src/Authentication/Native.php
+++ b/src/Authentication/Native.php
@@ -125,12 +125,10 @@ private function settingsRules(array $params): V
             case 'icloud':
             case 'hotmail': return $this->knownProviderRule();
 
-            case 'imap':     return $this->imapProviderRule();
-
             case 'gmail':    return $this->gmailProviderRule();
-
             case 'exchange': return $this->exchangeProviderRule();
 
+            case 'imap':
             default: return $this->imapProviderRule();
         }
     }
diff --git a/src/Request/AbsBase.php b/src/Request/AbsBase.php
index 6a2102f..ec3bdf2 100644
--- a/src/Request/AbsBase.php
+++ b/src/Request/AbsBase.php
@@ -12,7 +12,7 @@
  * ----------------------------------------------------------------------------------
  *
  * @author lanlin
- * @change 2020/06/28
+ * @change 2020/09/21
  */
 trait AbsBase
 {
@@ -102,6 +102,8 @@ public function setBody($body) : self
      */
     public function setQuery(array $query) : self
     {
+        $query = Helper::boolToString($query);
+
         $this->queryParams = ['query' => $query];
 
         return $this;
diff --git a/src/Utilities/Helper.php b/src/Utilities/Helper.php
index 8d605d6..9a9bd7d 100644
--- a/src/Utilities/Helper.php
+++ b/src/Utilities/Helper.php
@@ -10,7 +10,7 @@
  * ----------------------------------------------------------------------------------
  *
  * @author lanlin
- * @change 2020/04/26
+ * @change 2020/09/21
  */
 class Helper
 {
@@ -110,6 +110,28 @@ public static function fooToArray($foo): array
 
     // ------------------------------------------------------------------------------
 
+    /**
+     * convert boolean to string value
+     *
+     * @param array $data
+     *
+     * @return array
+     */
+    public static function boolToString(array $data): array
+    {
+        foreach ($data as $key => $val)
+        {
+            if (\is_bool($val))
+            {
+                $data[$key] = $val ? 'true' : 'false';
+            }
+        }
+
+        return $data;
+    }
+
+    // ------------------------------------------------------------------------------
+
     /**
      * pickup element from inside array
      *