Merge pull request #777 from langflow-ai/add-docling-serve-env-var

feat: new env var to override docling serve host

.env.example

@@ -66,6 +66,10 @@ EMBEDDING_MODEL=
 # OPTIONAL url for openrag link to langflow in the UI
 LANGFLOW_PUBLIC_URL=
 
+# OPTIONAL: Override the full docling-serve URL (e.g., for remote instances)
+# If not set, auto-detects host and uses port 5001
+# DOCLING_SERVE_URL=http://my-docling-server:5001
+
 # OPTIONAL: Override host for docling service (for special networking setups)
 # HOST_DOCKER_INTERNAL=host.containers.internal
 

src/api/docling.py

@@ -1,5 +1,6 @@
 """Docling service proxy endpoints."""
 
+import os
 import socket
 import struct
 from pathlib import Path
@@ -73,7 +74,13 @@ def determine_docling_host() -> str:
     return "localhost"
 
 
-# Detect the host IP once at startup
+# Use explicit URL if provided, otherwise auto-detect host
+_docling_url_override = os.getenv("DOCLING_SERVE_URL")
+if _docling_url_override:
+    DOCLING_SERVICE_URL = _docling_url_override.rstrip("/")
+    HOST_IP = _docling_url_override  # For display in health responses
+    logger.info("Using DOCLING_SERVE_URL override: %s", DOCLING_SERVICE_URL)
+else:
     HOST_IP = determine_docling_host()
     DOCLING_SERVICE_URL = f"http://{HOST_IP}:5001"