fix: allow external knowledge api use simple host (langgenius#9966)

Author: hjlarry

api/services/external_knowledge_service.py

@@ -70,7 +70,7 @@ def check_endpoint_and_api_key(settings: dict):
 
         endpoint = f"{settings['endpoint']}/retrieval"
         api_key = settings["api_key"]
-        if not validators.url(endpoint):
+        if not validators.url(endpoint, simple_host=True):
             raise ValueError(f"invalid endpoint: {endpoint}")
         try:
             response = httpx.post(endpoint, headers={"Authorization": f"Bearer {api_key}"})