diff --git a/modules/openapi-generator/src/main/resources/python/configuration.mustache b/modules/openapi-generator/src/main/resources/python/configuration.mustache
index 511281f298e4..039b2a85519f 100644
--- a/modules/openapi-generator/src/main/resources/python/configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/python/configuration.mustache
@@ -3,6 +3,9 @@
 {{>partial_header}}
 
 
+{{#async}}
+import base64
+{{/async}}
 import copy
 import http.client as httplib
 import logging
@@ -14,7 +17,9 @@ import sys
 from typing import Any, ClassVar, Dict, List, Literal, Optional, TypedDict, Union
 from typing_extensions import NotRequired, Self
 
+{{^async}}
 import urllib3
+{{/async}}
 
 {{#hasHttpSignatureMethods}}
 from {{packageName}}.signing import HttpSigningConfiguration
@@ -187,7 +192,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
 {{#hasAuthMethods}}
     :Example:
@@ -353,7 +358,9 @@ conf = {{{packageName}}}.Configuration(
         """Logging Settings
         """
         self.logger["package_logger"] = logging.getLogger("{{packageName}}")
+        {{^async}}
         self.logger["urllib3_logger"] = logging.getLogger("urllib3")
+        {{/async}}
         self.logger_format = '%(asctime)s %(levelname)s %(message)s'
         """Log format
         """
@@ -615,9 +622,17 @@ conf = {{{packageName}}}.Configuration(
         password = ""
         if self.password is not None:
             password = self.password
+
+        {{#async}}
+        return "Basic " + base64.b64encode(
+            (username + ":" + password).encode('utf-8')
+        ).decode('utf-8')
+        {{/async}}
+        {{^async}}
         return urllib3.util.make_headers(
             basic_auth=username + ':' + password
         ).get('authorization')
+        {{/async}}
 
     def auth_settings(self)-> AuthSettings:
         """Gets Auth Settings dict for api client.
@@ -720,6 +735,11 @@ conf = {{{packageName}}}.Configuration(
                         ]
                         {{/-last}}
                         {{/enumValues}}
+                        {{^enumValues}}
+                        {{#async}}
+                        'enum_values': []
+                        {{/async}}
+                        {{/enumValues}}
                         }{{^-last}},{{/-last}}
                 {{#-last}}
                     }
@@ -762,6 +782,7 @@ conf = {{{packageName}}}.Configuration(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/configuration.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/configuration.py
index 6f5f511966c6..bc8fb73562ff 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/configuration.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/configuration.py
@@ -166,7 +166,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -504,6 +504,7 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
+
         return urllib3.util.make_headers(
             basic_auth=username + ':' + password
         ).get('authorization')
@@ -587,6 +588,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/client/echo_api/python/openapi_client/configuration.py b/samples/client/echo_api/python/openapi_client/configuration.py
index 6f5f511966c6..bc8fb73562ff 100644
--- a/samples/client/echo_api/python/openapi_client/configuration.py
+++ b/samples/client/echo_api/python/openapi_client/configuration.py
@@ -166,7 +166,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -504,6 +504,7 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
+
         return urllib3.util.make_headers(
             basic_auth=username + ':' + password
         ).get('authorization')
@@ -587,6 +588,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/configuration.py b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/configuration.py
index 2d12349c1a3c..8a5ebdc1143f 100644
--- a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 """  # noqa: E501
 
 
+import base64
 import copy
 import http.client as httplib
 import logging
@@ -20,7 +21,6 @@
 from typing import Any, ClassVar, Dict, List, Literal, Optional, TypedDict, Union
 from typing_extensions import NotRequired, Self
 
-import urllib3
 
 from petstore_api.signing import HttpSigningConfiguration
 
@@ -171,7 +171,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -325,7 +325,6 @@ def __init__(
         """Logging Settings
         """
         self.logger["package_logger"] = logging.getLogger("petstore_api")
-        self.logger["urllib3_logger"] = logging.getLogger("urllib3")
         self.logger_format = '%(asctime)s %(levelname)s %(message)s'
         """Log format
         """
@@ -574,9 +573,10 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
-        return urllib3.util.make_headers(
-            basic_auth=username + ':' + password
-        ).get('authorization')
+
+        return "Basic " + base64.b64encode(
+            (username + ":" + password).encode('utf-8')
+        ).decode('utf-8')
 
     def auth_settings(self)-> AuthSettings:
         """Gets Auth Settings dict for api client.
@@ -727,6 +727,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/openapi3/client/petstore/python-httpx/petstore_api/configuration.py b/samples/openapi3/client/petstore/python-httpx/petstore_api/configuration.py
index 2d12349c1a3c..8a5ebdc1143f 100644
--- a/samples/openapi3/client/petstore/python-httpx/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python-httpx/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 """  # noqa: E501
 
 
+import base64
 import copy
 import http.client as httplib
 import logging
@@ -20,7 +21,6 @@
 from typing import Any, ClassVar, Dict, List, Literal, Optional, TypedDict, Union
 from typing_extensions import NotRequired, Self
 
-import urllib3
 
 from petstore_api.signing import HttpSigningConfiguration
 
@@ -171,7 +171,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -325,7 +325,6 @@ def __init__(
         """Logging Settings
         """
         self.logger["package_logger"] = logging.getLogger("petstore_api")
-        self.logger["urllib3_logger"] = logging.getLogger("urllib3")
         self.logger_format = '%(asctime)s %(levelname)s %(message)s'
         """Log format
         """
@@ -574,9 +573,10 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
-        return urllib3.util.make_headers(
-            basic_auth=username + ':' + password
-        ).get('authorization')
+
+        return "Basic " + base64.b64encode(
+            (username + ":" + password).encode('utf-8')
+        ).decode('utf-8')
 
     def auth_settings(self)-> AuthSettings:
         """Gets Auth Settings dict for api client.
@@ -727,6 +727,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/openapi3/client/petstore/python-lazyImports/petstore_api/configuration.py b/samples/openapi3/client/petstore/python-lazyImports/petstore_api/configuration.py
index 0415f9599ae0..0bd1cbdcadd2 100644
--- a/samples/openapi3/client/petstore/python-lazyImports/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python-lazyImports/petstore_api/configuration.py
@@ -172,7 +172,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -578,6 +578,7 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
+
         return urllib3.util.make_headers(
             basic_auth=username + ':' + password
         ).get('authorization')
@@ -731,6 +732,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "
diff --git a/samples/openapi3/client/petstore/python/petstore_api/configuration.py b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
index 0415f9599ae0..0bd1cbdcadd2 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
@@ -172,7 +172,7 @@ class Configuration:
     :param ca_cert_data: verify the peer using concatenated CA certificate data
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
-    :param key_file: the path to a client key file, for mTLS. 
+    :param key_file: the path to a client key file, for mTLS.
 
     :Example:
 
@@ -578,6 +578,7 @@ def get_basic_auth_token(self) -> Optional[str]:
         password = ""
         if self.password is not None:
             password = self.password
+
         return urllib3.util.make_headers(
             basic_auth=username + ':' + password
         ).get('authorization')
@@ -731,6 +732,7 @@ def get_host_from_settings(
                 variable_name, variable['default_value'])
 
             if 'enum_values' in variable \
+                    and variable['enum_values'] \
                     and used_value not in variable['enum_values']:
                 raise ValueError(
                     "The variable `{0}` in the host URL has invalid value "