Update app.py

app.py

@@ -1,5 +1,5 @@
 import os
-from langchain.document_loaders import PyPDFLoader
+from langchain.document_loaders import PyPDFLoader, OnlinePDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.chat_models import ChatOpenAI
 from langchain.llms import OpenAI
@@ -58,7 +58,7 @@ def summarize_pdf(pdf_file, api_key,
                   custom_map_prompt, custom_combine_prompt):
   global pdf_docs
   # Read PDF
-  loader = PyPDFLoader(pdf_file.name)
+  loader = OnlinePDFLoader(pdf_file.name)
   pdf_docs = loader.load_and_split(text_splitter)
   file_check(pdf_file)