fix(llm): fix boto3 metadata endpoint

Author: ionmincu

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "uipath-langchain"
-version = "0.5.8"
+version = "0.5.9"
 description = "Python SDK that enables developers to build and deploy LangGraph agents to the UiPath Cloud Platform"
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.11"

src/uipath_langchain/chat/bedrock.py

@@ -38,6 +38,8 @@ def _check_bedrock_dependencies() -> None:
 _check_bedrock_dependencies()
 
 import boto3
+from botocore import UNSIGNED
+from botocore.config import Config
 from langchain_aws import (
     ChatBedrock,
     ChatBedrockConverse,
@@ -90,6 +92,7 @@ def get_client(self):
             region_name="none",
             aws_access_key_id="none",
             aws_secret_access_key="none",
+            config=Config(signature_version=UNSIGNED),
         )
         client.meta.events.register(
             "before-send.bedrock-runtime.*", self._modify_request
@@ -167,6 +170,7 @@ def __init__(
         client = passthrough_client.get_client()
         kwargs["client"] = client
         kwargs["model"] = model_name
+        kwargs.setdefault("region_name", "none")
         super().__init__(**kwargs)
         self.model = model_name
 
@@ -214,5 +218,6 @@ def __init__(
         client = passthrough_client.get_client()
         kwargs["client"] = client
         kwargs["model"] = model_name
+        kwargs.setdefault("region_name", "none")
         super().__init__(**kwargs)
         self.model = model_name