diff --git a/server.py b/server.py
index a2d5961..ed8ac4b 100644
--- a/server.py
+++ b/server.py
@@ -279,6 +279,7 @@ def preview_url(
                     f"Failed to fetch {e.response.url} - HTTP {e.response.status_code}: {e.response.text}"
                 )
             except httpx.NetworkError as e:
+                logging.debug(f"Failed to fetch {url}", exc_info=True)
                 raise HTTPException(502, f"Failed to fetch {url} - {e}")
 
             if "text/html" not in response.headers.get("content-type", ""):