config: change default value of CURLRequest::$shareOptions

app/Config/CURLRequest.php

@@ -16,5 +16,5 @@ class CURLRequest extends BaseConfig
      * If true, all the options won't be reset between requests.
      * It may cause an error request with unnecessary headers.
      */
-    public bool $shareOptions = true;
+    public bool $shareOptions = false;
 }

user_guide_src/source/installation/upgrade_440.rst

@@ -153,6 +153,8 @@ and it is recommended that you merge the updated versions with your application:
 Config
 ------
 
+- app/Config/CURLRequest.php
+    - The default value of :ref:`$shareOptions <curlrequest-sharing-options>` has been change to ``false``.
 - app/Config/Exceptions.php
     - Added the new method ``handler()`` that define custom Exception Handlers.
       See :ref:`custom-exception-handlers`.

user_guide_src/source/libraries/curlrequest.rst

@@ -23,17 +23,23 @@ to change very little to move over to use Guzzle.
 Config for CURLRequest
 **********************
 
+.. _curlrequest-sharing-options:
+
 Sharing Options
 ===============
 
-Due to historical reasons, by default, the CURLRequest shares all the options between requests.
-If you send more than one request with an instance of the class,
-this behavior may cause an error request with unnecessary headers and body.
+.. note:: Since v4.4.0, the default value has been changed to ``false``. This
+    setting exists only for backward compatibility. New users do not need to
+    change the setting.
 
-You can change the behavior by editing the following config parameter value in **app/Config/CURLRequest.php** to ``false``:
+If you want to share all the options between requests, set ``$shareOptions`` to
+``true`` in **app/Config/CURLRequest.php**:
 
 .. literalinclude:: curlrequest/001.php
 
+If you send more than one request with an instance of the class, this behavior
+may cause an error request with unnecessary headers and body.
+
 .. note:: Before v4.2.0, the request body is not reset even if ``$shareOptions`` is false due to a bug.
 
 *******************

user_guide_src/source/libraries/curlrequest/001.php

@@ -6,7 +6,6 @@
 
 class CURLRequest extends BaseConfig
 {
-    public $shareOptions = false;
-
     // ...
+    public bool $shareOptions = true;
 }