fix(llms,embeddings): repair HTTP proxy support (httpx>=0.28) and preserve proxies in LlmFactory (#5447)

Co-authored-by: kartik-mem0 <kartik.labhshetwar@mem0.ai>

tests/llms/test_azure_openai.py

@@ -289,7 +289,7 @@ def test_generate_with_http_proxies(default_headers):
             api_version=None,
             default_headers=default_headers,
         )
-        mock_http_client.assert_called_once_with(proxies="http://testproxy.mem0.net:8000")
+        mock_http_client.assert_called_once_with(proxy="http://testproxy.mem0.net:8000")
 
 
 def test_init_with_api_key(monkeypatch):

tests/llms/test_openai.py

@@ -1,8 +1,10 @@
 import os
 from unittest.mock import Mock, patch
 
+import httpx
 import pytest
 
+from mem0.configs.llms.base import BaseLlmConfig
 from mem0.configs.llms.openai import OpenAIConfig
 from mem0.llms.openai import OpenAILLM
 
@@ -451,3 +453,14 @@ def test_callback_with_tools(mock_openai_client):
     mock_callback.assert_called_once()
     # Check that tool_calls exists in the message
     assert hasattr(mock_callback.call_args[0][1].choices[0].message, 'tool_calls')
+
+
+def test_openai_llm_preserves_proxies_from_base_config(mock_openai_client):
+    config = BaseLlmConfig(
+        model="gpt-4.1-nano-2025-04-14",
+        api_key="api_key",
+        http_client_proxies="http://proxy.local:8080",
+    )
+    llm = OpenAILLM(config)
+    assert llm.config.http_client_proxies == "http://proxy.local:8080"
+    assert isinstance(llm.config.http_client, httpx.Client)