Support customizing “Accept” header and added a testcase to test custom header

Author: Yashks1994

Diff for: dynamic/client.py

@@ -219,8 +219,10 @@ def request(self, method, path, body=None, **params):
         header_params = params.get('header_params', {})
         form_params = []
         local_var_files = {}
-        # HTTP header `Accept`
-        header_params['Accept'] = self.client.select_header_accept([
+
+        # User didn't specify the Accept header. Default it to json and yaml.
+        if not 'Accept' in header_params.keys():
+            header_params['Accept'] = self.client.select_header_accept([
             'application/json',
             'application/yaml',
         ])

Diff for: dynamic/test_client.py

@@ -359,11 +359,22 @@ def test_configmap_apis(self):
 
         resp = api.get(namespace='default', pretty=True, label_selector="e2e-test=true")
         self.assertEqual([], resp.items)
-
+    
     def test_node_apis(self):
         client = DynamicClient(api_client.ApiClient(configuration=self.config))
         api = client.resources.get(api_version='v1', kind='Node')
 
         for item in api.get().items:
             node = api.get(name=item.metadata.name)
             self.assertTrue(len(dict(node.metadata.labels)) > 0)
+    
+    # test_node_apis_partial_object_metadata lists all nodes in the cluster, but only retrieves object metadata
+    def test_node_apis_partial_object_metadata(self):
+        client = DynamicClient(api_client.ApiClient(configuration=self.config))
+        api = client.resources.get(api_version='v1', kind='Node')
+        
+        params = {'header_params': {'Accept': 'application/json;as=PartialObjectMetadataList;v=v1;g=meta.k8s.io'}}
+        resp = api.get(**params)
+        self.assertEqual('PartialObjectMetadataList', resp.kind)
+        self.assertEqual('meta.k8s.io/v1', resp.apiVersion)
+