fix session.py for proxy

Author: fuku2014

nifcloud/session.py

@@ -2,7 +2,6 @@
 
 from botocore import __version__ as botocore_version
 from botocore import session
-from botocore.httpsession import URLLib3Session
 from botocore.session import get_session  # noqa: F401
 
 import nifcloud
@@ -16,14 +15,7 @@
 ssl_context.set_ciphers(f"{default_cipher_names}:{extra_ciphers}")
 
 
-class CustomURLLib3Session(URLLib3Session):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self._manager.connection_pool_kw['ssl_context'] = ssl_context
-
-
 class Session(session.Session):
-
     def __init__(self, session_vars=None, event_hooks=None,
                  include_builtin_handlers=True, profile=None):
         super(Session, self).__init__(session_vars, event_hooks,
@@ -37,11 +29,22 @@ def create_client(self, service_name, region_name=None, api_version=None,
                       nifcloud_access_key_id=None, nifcloud_secret_access_key=None,
                       nifcloud_session_token=None, config=None):
         client = super(Session, self).create_client(
-            service_name, region_name=region_name, api_version=api_version, use_ssl=use_ssl,
-            verify=verify, endpoint_url=endpoint_url, aws_access_key_id=nifcloud_access_key_id,
-            aws_secret_access_key=nifcloud_secret_access_key, aws_session_token=nifcloud_session_token, config=config
+            service_name,
+            region_name=region_name,
+            api_version=api_version,
+            use_ssl=use_ssl,
+            verify=verify,
+            endpoint_url=endpoint_url,
+            aws_access_key_id=nifcloud_access_key_id,
+            aws_secret_access_key=nifcloud_secret_access_key,
+            aws_session_token=nifcloud_session_token,
+            config=config
         )
-        client._endpoint.http_session = CustomURLLib3Session()
+
+        http_session = client._endpoint.http_session
+        if hasattr(http_session, '_manager'):
+            http_session._manager.connection_pool_kw['ssl_context'] = ssl_context
+
         return client