diff --git a/ringcentral/http/client.py b/ringcentral/http/client.py
index ef48c46..bbd1ebc 100644
--- a/ringcentral/http/client.py
+++ b/ringcentral/http/client.py
@@ -75,8 +75,7 @@ def create_request(self, method='', url='', query_params=None, body=None, header
                 url = url + ('&' if url.find('?') > 0 else '?') + query
 
         content_type = None
-        accept = None
-
+        
         if headers is None:
             headers = {}
 
@@ -86,16 +85,12 @@ def create_request(self, method='', url='', query_params=None, body=None, header
             if key.lower().find('content-type') >= 0:
                 content_type = value
             if key.lower().find('accept') >= 0:
-                accept = value
+                headers['Accept'] = value
 
         if content_type is None:
             content_type = 'application/json'
             headers['Content-Type'] = content_type
 
-        if accept is None:
-            accept = 'application/json'
-            headers['Accept'] = accept
-
         if content_type.lower().find('application/json') >= 0:
             body = json.dumps(body) if body else None
         elif content_type.lower().find('application/x-www-form-urlencoded') >= 0:
diff --git a/ringcentral/platform/platform_test.py b/ringcentral/platform/platform_test.py
index d1165a9..6f8f4a7 100644
--- a/ringcentral/platform/platform_test.py
+++ b/ringcentral/platform/platform_test.py
@@ -26,9 +26,9 @@ def test_login_code(self, mock):
         sdk.platform().login(code='foo')
         text = str(mock.request_history[-1].text)
         if sys.version_info[0] == 3:
-            self.assertEqual(text, 'grant_type=authorization_code&redirect_uri=mock%3A%2F%2Fwhatever-redirect&code=foo')
+            self.assertEqual(text, 'grant_type=authorization_code&redirect_uri=https%3A%2F%2Fwhatever-redirect&code=foo')
         else:
-            self.assertEqual(text, 'code=foo&grant_type=authorization_code&redirect_uri=mock%3A%2F%2Fwhatever-redirect')
+            self.assertEqual(text, 'code=foo&grant_type=authorization_code&redirect_uri=https%3A%2F%2Fwhatever-redirect')
 
     def test_login_fail(self, mock):
         sdk = self.get_sdk(mock)
@@ -123,7 +123,7 @@ def test_logout(self, mock):
     def test_api_url(self, mock):
         sdk = self.get_sdk(mock)
 
-        exp1 = 'mock://whatever/restapi/v1.0/account/~/extension/~?_method=POST&access_token=ACCESS_TOKEN'
+        exp1 = 'https://whatever/restapi/v1.0/account/~/extension/~?_method=POST&access_token=ACCESS_TOKEN'
         act1 = sdk.platform().create_url('/account/~/extension/~', add_server=True, add_method='POST', add_token=True)
         self.assertEqual(exp1, act1)
 
@@ -134,12 +134,12 @@ def test_api_url(self, mock):
 
     def test_api_url_custom_prefixes(self, mock):
         sdk = self.get_sdk(mock)
-        exp = 'mock://whatever/scim/v2/foo'
+        exp = 'https://whatever/scim/v2/foo'
         url = '/scim/v2/foo'
         act = sdk.platform().create_url(url, add_server=True)
         self.assertEqual(exp, act)
 
-        exp = 'mock://whatever/analytics/phone/foo'
+        exp = 'https://whatever/analytics/phone/foo'
         url = '/analytics/phone/foo'
         act = sdk.platform().create_url(url, add_server=True)
         self.assertEqual(exp, act)
diff --git a/ringcentral/sdk_test.py b/ringcentral/sdk_test.py
index 67ae2eb..0df1fa0 100644
--- a/ringcentral/sdk_test.py
+++ b/ringcentral/sdk_test.py
@@ -8,8 +8,8 @@
 
 class TestSDK(TestCase):
     def test_instance(self):
-        sdk = SDK('whatever', 'whatever', 'mock://whatever')
-        self.assertEqual(sdk.platform().create_url('/foo', add_server=True), 'mock://whatever/restapi/v1.0/foo')
+        sdk = SDK('whatever', 'whatever', 'https://whatever')
+        self.assertEqual(sdk.platform().create_url('/foo', add_server=True), 'https://whatever/restapi/v1.0/foo')
 
 
 if __name__ == '__main__':
diff --git a/ringcentral/test/testcase.py b/ringcentral/test/testcase.py
index f5766ed..e49f04e 100644
--- a/ringcentral/test/testcase.py
+++ b/ringcentral/test/testcase.py
@@ -18,7 +18,7 @@ def __init__(self, method_name=None):
 
     def get_sdk(self, mock):
 
-        sdk = SDK('whatever', 'whatever', 'mock://whatever', redirect_uri='mock://whatever-redirect')
+        sdk = SDK('whatever', 'whatever', 'https://whatever', redirect_uri='https://whatever-redirect')
 
         self.authentication_mock(mock)
         sdk.platform().login('18881112233', None, 'password')
@@ -44,7 +44,7 @@ def get_sdk(self, mock):
     def add(self, mock, method, url, body, status=200):
         mock.register_uri(
             method=method,
-            url='mock://whatever' + url,
+            url='https://whatever' + url,
             text=json.dumps(body),
             headers={'Content-Type': 'application/json'},
             status_code=status