Do not use mutable default arguments

Using mutable default arguments is a common Python problem, see e.g.
https://docs.python-guide.org/writing/gotchas/#mutable-default-arguments

In this specific case the default argument even tries to setup some
infrastructure settings at import time, which can potentially fail.

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.2] - TBD
+
+### Added
+
+### Changed
+- Do not use mutable default arguments for HttpxRequestAdapter.[#383](https://github.com/microsoft/kiota-http-python/pull/383)
+
 ## [1.3.1] - 2024-02-13
 
 ### Added

kiota_http/_version.py

@@ -1 +1 @@
-VERSION: str = '1.3.1'
+VERSION: str = '1.3.2'

kiota_http/httpx_request_adapter.py

@@ -1,10 +1,8 @@
 """HTTPX client request adapter."""
 import re
-from collections.abc import AsyncIterable, Iterable
 from datetime import datetime
 from typing import Any, Dict, Generic, List, Optional, TypeVar, Union
 from urllib import parse
-from urllib.parse import unquote
 
 import httpx
 from kiota_abstractions.api_client_builder import (
@@ -63,29 +61,29 @@ class HttpxRequestAdapter(RequestAdapter, Generic[ModelType]):
     def __init__(
         self,
         authentication_provider: AuthenticationProvider,
-        parse_node_factory: ParseNodeFactory = ParseNodeFactoryRegistry(),
-        serialization_writer_factory:
-        SerializationWriterFactory = SerializationWriterFactoryRegistry(),
-        http_client: httpx.AsyncClient = KiotaClientFactory.create_with_default_middleware(),
-        base_url: str = "",
-        observability_options=ObservabilityOptions(),
+        parse_node_factory: Optional[ParseNodeFactory] = None,
+        serialization_writer_factory: Optional[SerializationWriterFactory] = None,
+        http_client: Optional[httpx.AsyncClient] = None,
+        base_url: Optional[str] = None,
+        observability_options: Optional[ObservabilityOptions] = None,
     ) -> None:
         if not authentication_provider:
             raise TypeError("Authentication provider cannot be null")
         self._authentication_provider = authentication_provider
         if not parse_node_factory:
-            raise TypeError("Parse node factory cannot be null")
+            parse_node_factory = ParseNodeFactoryRegistry()
         self._parse_node_factory = parse_node_factory
         if not serialization_writer_factory:
-            raise TypeError("Serialization writer factory cannot be null")
+            serialization_writer_factory = SerializationWriterFactoryRegistry()
         self._serialization_writer_factory = serialization_writer_factory
         if not http_client:
-            raise TypeError("Http Client cannot be null")
-        if not observability_options:
-            observability_options = ObservabilityOptions()
-
+            http_client = KiotaClientFactory.create_with_default_middleware()
         self._http_client = http_client
+        if not base_url:
+            base_url = ""
         self._base_url: str = base_url
+        if not observability_options:
+            observability_options = ObservabilityOptions()
         self.observability_options = observability_options
 
     @property