diff --git a/auth0/v3/authentication/base.py b/auth0/v3/authentication/base.py
index 21e02aab..c8d03cad 100644
--- a/auth0/v3/authentication/base.py
+++ b/auth0/v3/authentication/base.py
@@ -45,7 +45,7 @@ def __init__(self, domain, telemetry=True):
             }).encode('utf-8')
 
             self.base_headers.update({
-                'User-Agent': 'Python/%s' % py_version,
+                'User-Agent': 'Python/{}'.format(py_version),
                 'Auth0-Client': base64.b64encode(auth0_client),
             })
 
diff --git a/auth0/v3/management/rest.py b/auth0/v3/management/rest.py
index cca81c37..e3c6eac6 100644
--- a/auth0/v3/management/rest.py
+++ b/auth0/v3/management/rest.py
@@ -16,6 +16,10 @@ class RestClient(object):
     def __init__(self, jwt, telemetry=True):
         self.jwt = jwt
 
+        self.base_headers = {
+            'Authorization': 'Bearer {}'.format(self.jwt),
+            'Content-Type': 'application/json',
+        }
         if telemetry:
             py_version = platform.python_version()
             version = sys.modules['auth0'].__version__
@@ -36,29 +40,19 @@ def __init__(self, jwt, telemetry=True):
                 ]
             }).encode('utf-8')
 
-            self.base_headers = {
+            self.base_headers.update({
                 'User-Agent': 'Python/{}'.format(py_version),
                 'Auth0-Client': base64.b64encode(auth0_client),
-                'Content-Type': 'application/json'
-            }
-        else:
-            self.base_headers = {}
+            })
 
     def get(self, url, params=None):
         headers = self.base_headers.copy()
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-        })
 
         response = requests.get(url, params=params, headers=headers)
         return self._process_response(response)
 
     def post(self, url, data=None):
         headers = self.base_headers.copy()
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-            'Content-Type': 'application/json'
-        })
 
         response = requests.post(url, data=json.dumps(data or {}), headers=headers)
         return self._process_response(response)
@@ -66,38 +60,24 @@ def post(self, url, data=None):
     def file_post(self, url, data=None, files=None):
         headers = self.base_headers.copy()
         headers.pop('Content-Type', None)
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-        })
 
         response = requests.post(url, data=data, files=files, headers=headers)
         return self._process_response(response)
 
     def patch(self, url, data=None):
         headers = self.base_headers.copy()
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-            'Content-Type': 'application/json'
-        })
 
         response = requests.patch(url, data=json.dumps(data or {}), headers=headers)
         return self._process_response(response)
 
     def put(self, url, data=None):
         headers = self.base_headers.copy()
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-            'Content-Type': 'application/json'
-        })
 
         response = requests.put(url, data=json.dumps(data or {}), headers=headers)
         return self._process_response(response)
 
     def delete(self, url, params=None):
         headers = self.base_headers.copy()
-        headers.update({
-            'Authorization': 'Bearer {}'.format(self.jwt),
-        })
 
         response = requests.delete(url, headers=headers, params=params or {})
         return self._process_response(response)
diff --git a/auth0/v3/test/management/test_rest.py b/auth0/v3/test/management/test_rest.py
index 52187b7b..9d578436 100644
--- a/auth0/v3/test/management/test_rest.py
+++ b/auth0/v3/test/management/test_rest.py
@@ -13,7 +13,10 @@ class TestRest(unittest.TestCase):
     @mock.patch('requests.get')
     def test_get(self, mock_get):
         rc = RestClient(jwt='a-token', telemetry=False)
-        headers = {'Authorization': 'Bearer a-token'}
+        headers = {
+            'Authorization': 'Bearer a-token',
+            'Content-Type': 'application/json',
+        }
 
         mock_get.return_value.text = '["a", "b"]'
         mock_get.return_value.status_code = 200
@@ -198,6 +201,20 @@ def test_post_error_with_no_response_text(self, mock_post):
             self.assertEqual(context.exception.error_code, 'a0.sdk.internal.unknown')
             self.assertEqual(context.exception.message, '')
 
+    @mock.patch('requests.post')
+    def test_file_post_content_type_is_none(self, mock_post):
+        rc = RestClient(jwt='a-token', telemetry=False)
+        headers = {'Authorization': 'Bearer a-token'}
+        mock_post.return_value.status_code = 200
+        mock_post.return_value.text = 'Success'
+
+        data = {'some': 'data'}
+        files = [mock.Mock()]
+
+        rc.file_post('the-url', data=data, files=files)
+
+        mock_post.assert_called_once_with('the-url', data=data, files=files, headers=headers)
+
     @mock.patch('requests.patch')
     def test_patch(self, mock_patch):
         rc = RestClient(jwt='a-token', telemetry=False)
@@ -234,7 +251,10 @@ def test_patch_errors(self, mock_patch):
     @mock.patch('requests.delete')
     def test_delete(self, mock_delete):
         rc = RestClient(jwt='a-token', telemetry=False)
-        headers = {'Authorization': 'Bearer a-token'}
+        headers = {
+            'Authorization': 'Bearer a-token',
+            'Content-Type': 'application/json',
+        }
 
         mock_delete.return_value.text = '["a", "b"]'
         mock_delete.return_value.status_code = 200
@@ -262,8 +282,12 @@ def test_delete_errors(self, mock_delete):
 
     def test_disabled_telemetry(self):
         rc = RestClient(jwt='a-token', telemetry=False)
+        expected_headers = {
+            'Content-Type': 'application/json',
+            'Authorization': 'Bearer a-token',
+        }
         
-        self.assertEqual(rc.base_headers, {})
+        self.assertEqual(rc.base_headers, expected_headers)
 
     def test_enabled_telemetry(self):
         rc = RestClient(jwt='a-token', telemetry=True)