diff --git a/app/common/http_client.py b/app/common/http_client.py
index e721b3c..3edbba6 100644
--- a/app/common/http_client.py
+++ b/app/common/http_client.py
@@ -7,15 +7,23 @@
 
 logger = getLogger(__name__)
 
-async_proxy_mounts = {
-    "http://": httpx.AsyncHTTPTransport(proxy=config.http_proxy),
-    "https://": httpx.AsyncHTTPTransport(proxy=config.http_proxy)
-} if config.http_proxy else {}
-
-sync_proxy_mounts = {
-    "http://": httpx.HTTPTransport(proxy=config.http_proxy),
-    "https://": httpx.HTTPTransport(proxy=config.http_proxy)
-} if config.http_proxy else {}
+async_proxy_mounts = (
+    {
+        "http://": httpx.AsyncHTTPTransport(proxy=str(config.http_proxy)),
+        "https://": httpx.AsyncHTTPTransport(proxy=str(config.http_proxy)),
+    }
+    if config.http_proxy
+    else {}
+)
+
+sync_proxy_mounts = (
+    {
+        "http://": httpx.HTTPTransport(proxy=str(config.http_proxy)),
+        "https://": httpx.HTTPTransport(proxy=str(config.http_proxy)),
+    }
+    if config.http_proxy
+    else {}
+)
 
 
 async def async_hook_request_tracing(request):
@@ -42,7 +50,7 @@ def create_async_client(request_timeout: int = 30) -> httpx.AsyncClient:
     """
     client_kwargs = {
         "timeout": request_timeout,
-        "event_hooks": {"request": [async_hook_request_tracing]}
+        "event_hooks": {"request": [async_hook_request_tracing]},
     }
 
     if config.http_proxy:
@@ -63,7 +71,7 @@ def create_client(request_timeout: int = 30) -> httpx.Client:
     """
     client_kwargs = {
         "timeout": request_timeout,
-        "event_hooks": {"request": [hook_request_tracing]}
+        "event_hooks": {"request": [hook_request_tracing]},
     }
 
     if config.http_proxy:
diff --git a/app/common/test_http_client.py b/app/common/test_http_client.py
index 8fe6baa..c8a5a43 100644
--- a/app/common/test_http_client.py
+++ b/app/common/test_http_client.py
@@ -27,3 +27,27 @@ def test_trace_id_set():
     )
     resp = client.get("http://localhost:1234/test")
     assert resp.text == "trace-id-value"
+
+
+def test_create_client_with_proxy(monkeypatch):
+    import importlib
+
+    from pydantic import HttpUrl
+
+    # Set http_proxy config before reloading http_client
+    monkeypatch.setattr(
+        "app.config.config.http_proxy", HttpUrl("http://proxy.example.com:8080")
+    )
+
+    # Reload the http_client module to trigger creation of proxy_mounts with HttpUrl set
+    # This would fail with the old code (AttributeError: 'HttpUrl' object has no attribute 'url')
+    import app.common.http_client
+
+    importlib.reload(app.common.http_client)
+
+    # Verify clients can be created
+    client = app.common.http_client.create_client()
+    assert client is not None
+
+    async_client = app.common.http_client.create_async_client()
+    assert async_client is not None