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>

mem0/utils/factory.py

@@ -100,7 +100,7 @@ class LlmFactory:
                     "top_k": config.top_k,
                     "enable_vision": config.enable_vision,
                     "vision_details": config.vision_details,
-                    "http_client_proxies": config.http_client,
+                    "http_client_proxies": config.http_client_proxies,
                 }
                 config_dict.update(kwargs)
                 config = config_class(**config_dict)

mem0/utils/http.py

@@ -0,0 +1,13 @@
+from typing import Dict, Optional, Union
+
+import httpx
+
+
+def build_http_client(http_client_proxies: Optional[Union[Dict, str]]) -> Optional[httpx.Client]:
+    if not http_client_proxies:
+        return None
+    if isinstance(http_client_proxies, dict):
+        return httpx.Client(
+            mounts={scheme: httpx.HTTPTransport(proxy=url) for scheme, url in http_client_proxies.items()}
+        )
+    return httpx.Client(proxy=http_client_proxies)