added unsigned boto3 requests config

app.py

@@ -1,5 +1,8 @@
 import gradio as gr
 import boto3
+from botocore import UNSIGNED
+from botocore.client import Config
+
 from langchain.document_loaders import WebBaseLoader
 
 from langchain.text_splitter import RecursiveCharacterTextSplitter
@@ -21,7 +24,7 @@ from langchain.prompts import ChatPromptTemplate
 #loader = WebBaseLoader(web_links)
 #documents = loader.load()
 
-s3 = boto3.client('s3')
+s3 = boto3.client('s3', config=Config(signature_version=UNSIGNED))
 s3.download_file('rad-rag-demos', 'vectorstores/chroma.sqlite3', './chroma_db/chroma.sqlite3')
      
 db = Chroma(persist_directory="./chroma_db", embedding_function=embeddings)