diff --git a/.readthedocs.yaml b/.readthedocs.yaml
new file mode 100644
index 0000000..70972a8
--- /dev/null
+++ b/.readthedocs.yaml
@@ -0,0 +1,10 @@
+version: 2
+
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.11"
+
+formats:
+  - pdf
+  - epub
diff --git a/HISTORY.md b/HISTORY.md
index e0a92fa..3548ad0 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,8 +1,12 @@
 Release History
 ===============
+1.15.0 (2023-08-30)
+-------------------
+- Support to manage domains for credential
+
 1.14.1 (2023-07-24)
 -------------------
-- Support additional session headers 
+- Support additional session headers
 
 1.14 (2022-11-28)
 -----------------
@@ -31,7 +35,7 @@ Release History
 - set dependency version
 
 1.9.1 (2022-03-29)
------------------
+------------------
 - change OrganizationFolder to inherit from WorkflowMultiBranchProject
 - `Jenkins.get_job` return consistent result
 
@@ -59,7 +63,7 @@ Release History
 - bugfix for `queue.get_build`
 
 1.5.1 (2021-05-11)
------------------
+------------------
 - Bugfix for nodes.iter_builds
 
 1.5 (2021-04-29)
diff --git a/api4jenkins/__init__.py b/api4jenkins/__init__.py
index 41fe8bd..c2c9bda 100644
--- a/api4jenkins/__init__.py
+++ b/api4jenkins/__init__.py
@@ -284,14 +284,13 @@ def plugins(self):
     @property
     def version(self):
         '''Version of Jenkins'''
-        return self.handle_req('GET', '').headers['X-Jenkins']
+        return self.handle_req('HEAD', '').headers['X-Jenkins']
 
     @property
     def credentials(self):
         '''An object for managing credentials.
         see :class:`Credentials <api4jenkins.credential.Credentials>`'''
-        return Credentials(self,
-                           f'{self.url}credentials/store/system/domain/_/')
+        return Credentials(self, f'{self.url}credentials/store/system/')
 
     @property
     def views(self):
diff --git a/api4jenkins/__version__.py b/api4jenkins/__version__.py
index 9e0ac10..2a553a2 100644
--- a/api4jenkins/__version__.py
+++ b/api4jenkins/__version__.py
@@ -1,5 +1,5 @@
 # encoding: utf-8
-__version__ = '1.14.1'
+__version__ = '1.15.0'
 __title__ = 'api4jenkins'
 __description__ = 'Jenkins Python Client'
 __url__ = 'https://github.com/joelee2012/api4jenkins'
diff --git a/api4jenkins/credential.py b/api4jenkins/credential.py
index 47664fb..e5278f1 100644
--- a/api4jenkins/credential.py
+++ b/api4jenkins/credential.py
@@ -7,11 +7,34 @@
 
 class Credentials(Item):
 
+    def get(self, name):
+        for key in self.api_json(tree='domains[urlName]')['domains'].keys():
+            if key == name:
+                return Domain(self.jenkins, f'{self.url}domain/{key}/')
+        return None
+
+    def create(self, xml):
+        self.handle_req('POST', 'createDomain',
+                        headers=self.headers, data=xml)
+
+    def __iter__(self):
+        for key in self.api_json(tree='domains[urlName]')['domains'].keys():
+            yield Domain(self.jenkins, f'{self.url}domain/{key}/')
+
+    def __getitem__(self, name):
+        return self.get(name)
+
+    @property
+    def global_domain(self):
+        return self['_']
+
+
+class Domain(Item, ConfigurationMixIn, DeletionMixIn):
+
     def get(self, id):
         for item in self.api_json(tree='credentials[id]')['credentials']:
             if item['id'] == id:
-                return Credential(self.jenkins,
-                                  f'{self.url}credential/{id}/')
+                return Credential(self.jenkins, f'{self.url}credential/{id}/')
         return None
 
     def create(self, xml):
@@ -20,8 +43,10 @@ def create(self, xml):
 
     def __iter__(self):
         for item in self.api_json(tree='credentials[id]')['credentials']:
-            yield Credential(self.jenkins,
-                             f'{self.url}credential/{item["id"]}/')
+            yield Credential(self.jenkins, f'{self.url}credential/{item["id"]}/')
+
+    def __getitem__(self, id):
+        return self.get(id)
 
 
 class Credential(Item, ConfigurationMixIn, DeletionMixIn):
diff --git a/api4jenkins/job.py b/api4jenkins/job.py
index c4e83d3..a14b2bb 100644
--- a/api4jenkins/job.py
+++ b/api4jenkins/job.py
@@ -96,8 +96,7 @@ def views(self):
 
     @property
     def credentials(self):
-        return Credentials(self.jenkins,
-                           f'{self.url}credentials/store/folder/domain/_/')
+        return Credentials(self.jenkins, f'{self.url}credentials/store/folder/')
 
     def __iter__(self):
         yield from self.iter()
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 6d7f464..e70915e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -15,12 +15,12 @@
 
 sys.path.insert(0, os.path.abspath('../../'))
 # -- Project information -----------------------------------------------------
+import api4jenkins
 
 project = 'api4jenkins'
-copyright = '2021, Joe Lee'
+copyright = '2023, Joe Lee'
 author = 'Joe Lee'
 
-import api4jenkins
 # The full version, including alpha/beta/rc tags
 release = api4jenkins.__version__
 
diff --git a/docs/source/index.rst b/docs/source/index.rst
index dd4759f..fa6d258 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -19,7 +19,8 @@ Jenkins Python Client
 
 
 
-`Python3 <https://www.python.org/>`_ client library for `Jenkins API <https://wiki.jenkins.io/display/JENKINS/Remote+access+API>`_.
+`Python3 <https://www.python.org/>`_ client library for 
+`Jenkins API <https://wiki.jenkins.io/display/JENKINS/Remote+access+API>`_.
 
 
 Features
@@ -36,7 +37,8 @@ Features
 Quick start
 ----------------------------------------
 
-Here is an example to create and build job, then monitor progressive output until it's done.
+Here is an example to create and build job, then monitor progressive output 
+until it's done.
 
 
     >>> from api4jenkins import Jenkins
@@ -86,9 +88,9 @@ Here is an example to create and build job, then monitor progressive output unti
    :maxdepth: 2
    :caption: Contents:
 
-  user/install.rst
-  user/example.rst
-  user/api.rst
+   user/install
+   user/example
+   user/api
 
 
 Indices and tables
diff --git a/docs/source/user/api.rst b/docs/source/user/api.rst
index 2996e28..f763664 100644
--- a/docs/source/user/api.rst
+++ b/docs/source/user/api.rst
@@ -73,11 +73,6 @@ API reference
    :undoc-members:
    :inherited-members:
 
-.. automodule:: api4jenkins.utils
-   :members:
-   :undoc-members:
-   :inherited-members:
-
 .. automodule:: api4jenkins.requester
    :members:
    :undoc-members:
diff --git a/docs/source/user/example.rst b/docs/source/user/example.rst
index 407982c..a56de58 100644
--- a/docs/source/user/example.rst
+++ b/docs/source/user/example.rst
@@ -77,8 +77,7 @@ Call `j.dynamic_attrs` to get the dynamic attributes of an Item::
     ['_class', 'mode', 'node_description', 'node_name', 'num_executors', 'description', 'quieting_down', 'slave_agent_port', 'use_crumbs', 'use_security']
 
 With Jenkins object you can manage many Items including: `Job`_, `Credential`_,
- `Node`_, `View`_, `Queue`_, `Plugin`_, `System`_ and so on. let's start with
-`Job`_ management.
+ `Node`_, `View`_, `Queue`_, `Plugin`_, `System`_ and so on. let's start with `Job`_ management.
 
 create job with `j.create_job()`::
 
@@ -521,8 +520,8 @@ and abort input::
 
     >>> build.get_pending_input().abort()
 
-WorkflowRun supports `archive artfacts <https://www.jenkins.io/doc/pipeline/steps/core/#archiveartifacts-archive-the-artifacts>`_,
- you can also process with api4jenkins::
+`WorkflowRun` supports `archive artfacts <https://www.jenkins.io/doc/pipeline/steps/core/#archiveartifacts-archive-the-artifacts>`_,
+you can also process with api4jenkins
 
 save file you interest::
 
@@ -537,33 +536,38 @@ save artifacts as zip::
 
 Credential
 -------------
-Credential is for saving secret data, `api4jenkins` support to manage system
-and folder based credentials, all credentials must be in default domain(_).
-more detail can be found: `using credentials <https://www.jenkins.io/doc/book/using/using-credentials/>`_
-and `credentials plugin user.doc <https://github.com/jenkinsci/credentials-plugin/blob/master/docs/user.adoc>`_
+Credential is for saving secret data, `api4jenkins` support to manage :class:`Jenkins <api4jenkins.Jenkins.credentials>`
+and :class:`Folder <api4jenkins.job.Folder.credentials>` based domains and credentials.
+
+create/get domain::
+
+    >>> xml = '''<com.cloudbees.plugins.credentials.domains.Domain>
+    ... <name>testing</name>
+    ... <description>Credentials for use against the *.test.example.com hosts</description>
+    ... <specifications>
+    ...   <com.cloudbees.plugins.credentials.domains.HostnameSpecification>
+    ...     <includes>*.test.example.com</includes>
+    ...     <excludes></excludes>
+    ...   </com.cloudbees.plugins.credentials.domains.HostnameSpecification>
+    ... </specifications>
+    ... </com.cloudbees.plugins.credentials.domains.Domain>'''
+    >>> folder.credentials.create(xml)
+    >>> domain = folder.credentials.get('testing')
 
-create/get folder based credential::
+.. note::
 
-    >>> xml = '''<com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>
-    ...   <id>user-id</id>
-    ...   <username>user-name</username>
-    ...   <password>user-password</password>
-    ...   <description>user id for testing</description>
-    ... </com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>'''
-    >>> folder.credentials.create(xml)
-    >>> credential = folder.credentials.get('user-id')
+    :class:`global_domain <api4jenkins.credential.Credentials.global_domain>` is shortcut of domain (_)
 
-create system based credential::
+create/get credential in domain::
 
     >>> xml = '''<com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>
-    ...   <scope>GLOBAL</scope>
     ...   <id>user-id</id>
     ...   <username>user-name</username>
     ...   <password>user-password</password>
     ...   <description>user id for testing</description>
     ... </com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>'''
-    >>> j.credentials.create(xml)
-    >>> credential = j.credentials.get('user-id')
+    >>> domain.create(xml)
+    >>> credential = domain.get('user-id')
 
 get/update configuration of credential::
 
@@ -576,16 +580,20 @@ delete credential::
     >>> credential.exists()
     False
 
-iterate folder credentials::
+iterate domain in `Folder` or `Jenkins`::
 
-    >>> for c in folder.credentials:
-    ...     print(c)
+    >>> for domain in folder:
+    ...     print(domain)
 
-iterate system credentials::
+iterate credentials in `Domain`::
 
-    >>> for c in j.credentials:
+    >>> for c in domain:
     ...     print(c)
 
+.. seealso::
+    
+    more detail can be found: `using credentials <https://www.jenkins.io/doc/book/using/using-credentials/>`_
+    and `credentials plugin user.doc <https://github.com/jenkinsci/credentials-plugin/blob/master/docs/user.adoc>`_
 
 View
 -------
@@ -801,9 +809,9 @@ run groovy script
 
     >>> j.system.run_script('println "this is test"')
 
-it also supports to manage `jcasc <https://www.jenkins.io/projects/jcasc/>`_ ::
+it also supports to manage `jcasc <https://www.jenkins.io/projects/jcasc/>`_ 
 
-to reload jcase
+to reload jcasc::
 
     >>> j.system.reload_jcasc()
 
@@ -1012,7 +1020,7 @@ iterate all case in test report and filter by status ::
     ...             print(case)
 
 Coverage report
------
+---------------
 
 Access coverage report generated by `JaCoCo <https://plugins.jenkins.io/jacoco/>`_, avaliable types are 'branchCoverage', 'classCoverage', 'complexityScore', 'instructionCoverage', 'lineCoverage', 'methodCoverage'::
 
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 997f1a1..8fa3781 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -65,9 +65,12 @@ def folder(jenkins):
 
 
 @pytest.fixture(autouse=True)
-def setup_folder(jenkins, folder_xml):
+def setup_folder(jenkins, folder_xml, credential_xml):
     jenkins.create_job('Level1_Folder1', folder_xml)
     jenkins.create_job('Level1_Folder1/Level2_Folder1', folder_xml)
+    folder = jenkins.get_job('Level1_Folder1')
+    folder.credentials.global_domain.create(credential_xml)
+    folder.credentials.create(load_xml('domain.xml'))
     yield
     jenkins.delete_job('Level1_Folder1')
 
diff --git a/tests/integration/test_credential.py b/tests/integration/test_credential.py
new file mode 100644
index 0000000..22c5032
--- /dev/null
+++ b/tests/integration/test_credential.py
@@ -0,0 +1,15 @@
+class TestCredentials:
+    def test_credentials_iter(self, folder):
+        assert len(list(folder.credentials)) == 2
+
+    def test_credential_get(self, folder):
+        assert folder.credentials.global_domain is not None
+        assert folder.credentials.get('not exists') is None
+
+    def test_domain_get(self, folder):
+        c = folder.credentials.global_domain['user-id']
+        assert c.id == 'user-id'
+        assert folder.credentials.global_domain['not exists'] is None
+
+    def test_domain_iter(self, folder):
+        assert len(list(folder.credentials.global_domain)) == 1
\ No newline at end of file
diff --git a/tests/integration/test_jenkins.py b/tests/integration/test_jenkins.py
index 2d42f39..60a7505 100644
--- a/tests/integration/test_jenkins.py
+++ b/tests/integration/test_jenkins.py
@@ -70,14 +70,14 @@ def test_iter_jobs(self, jenkins):
         assert len(list(jenkins)) == 1
         assert len(list(jenkins(2))) == 2
 
-    def test_credential(self, jenkins, credential_xml):
-        assert len(list(jenkins.credentials)) == 0
-        jenkins.credentials.create(credential_xml)
-        assert len(list(jenkins.credentials)) == 1
-        c = jenkins.credentials.get('user-id')
-        assert c.id == 'user-id'
-        c.delete()
-        assert c.exists() == False
+    # def test_credential(self, jenkins, credential_xml):
+    #     assert len(list(jenkins.credentials)) == 1
+    #     jenkins.credentials.global_domain.create(credential_xml)
+    #     assert len(list(jenkins.credentials.global_domain)) == 1
+    #     c = jenkins.credentials.get('user-id')
+    #     assert c.id == 'user-id'
+    #     c.delete()
+    #     assert c.exists() == False
 
     def test_view(self, jenkins, view_xml):
         assert len(list(jenkins.views)) == 1
diff --git a/tests/integration/tests_data/domain.xml b/tests/integration/tests_data/domain.xml
new file mode 100644
index 0000000..820a927
--- /dev/null
+++ b/tests/integration/tests_data/domain.xml
@@ -0,0 +1,10 @@
+<com.cloudbees.plugins.credentials.domains.Domain>
+    <name>testing</name>
+    <description>Credentials for use against the *.test.example.com hosts</description>
+    <specifications>
+      <com.cloudbees.plugins.credentials.domains.HostnameSpecification>
+        <includes>*.test.example.com</includes>
+        <excludes></excludes>
+      </com.cloudbees.plugins.credentials.domains.HostnameSpecification>
+    </specifications>
+   </com.cloudbees.plugins.credentials.domains.Domain>
\ No newline at end of file
diff --git a/tests/unit/conftest.py b/tests/unit/conftest.py
index 50d5967..a02dd29 100644
--- a/tests/unit/conftest.py
+++ b/tests/unit/conftest.py
@@ -8,7 +8,7 @@
 from api4jenkins.job import WorkflowJob, WorkflowMultiBranchProject
 from api4jenkins.build import WorkflowRun, FreeStyleBuild
 from api4jenkins import Credentials
-from api4jenkins.credential import Credential
+from api4jenkins.credential import Credential, Domain
 from api4jenkins import PluginsManager
 from api4jenkins import Queue
 from api4jenkins.queue import QueueItem
@@ -31,6 +31,8 @@ def _api_json(self, tree='', depth=0):
     elif isinstance(self, FreeStyleBuild):
         return load_json('run/freestylebuild.json')
     elif isinstance(self, Credentials):
+        return load_json('credential/domains.json')
+    elif isinstance(self, Domain):
         return load_json('credential/credentials.json')
     elif isinstance(self, Credential):
         return load_json('credential/user_psw.json')
diff --git a/tests/unit/test_credential.py b/tests/unit/test_credential.py
index 47f1ecb..ef68b10 100644
--- a/tests/unit/test_credential.py
+++ b/tests/unit/test_credential.py
@@ -1,23 +1,44 @@
 # encoding: utf-8
 
 import pytest
-from api4jenkins.credential import Credential
+from api4jenkins.credential import Credential, Domain
+
+
+@pytest.fixture
+def global_domain(jenkins):
+    return jenkins.credentials.global_domain
 
 
 class TestCredentials:
 
-    @pytest.mark.parametrize('id_, obj', [('not exist', type(None)), ('test-user', Credential)])
-    def test_get(self, jenkins, id_, obj):
-        assert isinstance(jenkins.credentials.get(id_), obj)
+    def test_get(self, jenkins):
+        assert isinstance(jenkins.credentials['_'], Domain)
+        assert jenkins.credentials['x'] is None
 
     def test_create(self, jenkins, mock_resp):
-        req_url = f'{jenkins.credentials.url}createCredentials'
+        req_url = f'{jenkins.credentials.url}createDomain'
         mock_resp.add('POST', req_url)
         jenkins.credentials.create('xml')
         assert mock_resp.calls[0].request.url == req_url
 
     def test_iter(self, jenkins):
-        creds = list(jenkins.credentials)
+        assert len(list(jenkins.credentials)) == 3
+
+
+class TestDomain:
+
+    @pytest.mark.parametrize('id_, obj', [('not exist', type(None)), ('test-user', Credential)])
+    def test_get(self, global_domain, id_, obj):
+        assert isinstance(global_domain[id_], obj)
+
+    def test_create(self, global_domain, mock_resp):
+        req_url = f'{global_domain.url}createCredentials'
+        mock_resp.add('POST', req_url)
+        global_domain.create('xml')
+        assert mock_resp.calls[0].request.url == req_url
+
+    def test_iter(self, global_domain):
+        creds = list(global_domain)
         assert len(creds) == 2
         assert all([isinstance(c, Credential) for c in creds])
 
diff --git a/tests/unit/test_jenkins.py b/tests/unit/test_jenkins.py
index b6f5cb5..b5ee236 100644
--- a/tests/unit/test_jenkins.py
+++ b/tests/unit/test_jenkins.py
@@ -24,7 +24,7 @@ def test_init_with_token(self, jenkins, monkeypatch, mock_resp):
         assert j._token.value == data['tokenValue']
 
     def test_version(self, jenkins, mock_resp):
-        mock_resp.add('GET', jenkins.url, headers={'X-Jenkins': '1.2.3'})
+        mock_resp.add('HEAD', jenkins.url, headers={'X-Jenkins': '1.2.3'})
         assert jenkins.version == '1.2.3'
 
     def test_attrs(self, jenkins):
diff --git a/tests/unit/tests_data/credential/domains.json b/tests/unit/tests_data/credential/domains.json
new file mode 100644
index 0000000..ca866f3
--- /dev/null
+++ b/tests/unit/tests_data/credential/domains.json
@@ -0,0 +1,17 @@
+{
+  "_class": "com.cloudbees.hudson.plugins.folder.properties.FolderCredentialsProvider$FolderCredentialsProperty$CredentialsStoreActionImpl",
+  "domains": {
+    "_": {
+      "_class": "com.cloudbees.plugins.credentials.CredentialsStoreAction$DomainWrapper",
+      "urlName": "_"
+    },
+    "production": {
+      "_class": "com.cloudbees.plugins.credentials.CredentialsStoreAction$DomainWrapper",
+      "urlName": "production"
+    },
+    "testing": {
+      "_class": "com.cloudbees.plugins.credentials.CredentialsStoreAction$DomainWrapper",
+      "urlName": "testing"
+    }
+  }
+}
\ No newline at end of file