code: import os
  import pickle
  import requests
  
  from flask import Flask, jsonify, request
  from flask_cors import CORS
  from google.auth.transport.requests import Request
  from google_auth_oauthlib.flow import InstalledAppFlow
  from llama_index import GPTSimpleVectorIndex, download_loader
  
  os.environ['OPENAI_API_KEY'] = 'xxxx'
  
  def authorize_gdocs():
      google_oauth2_scopes = [
          "https://www.googleapis.com/auth/documents.readonly"
      ]
      cred = None
      if os.path.exists("token.pickle"):
          with open("token.pickle", 'rb') as token:
              cred = pickle.load(token)
      if not cred or not cred.valid:
          if cred and cred.expired and cred.refresh_token:
              cred.refresh(Request())
          else:
              flow = InstalledAppFlow.from_client_secrets_file("credentials.json", google_oauth2_scopes)
              cred = flow.run_local_server(port=0)
          with open("token.pickle", 'wb') as token:
              pickle.dump(cred, token)
  
  app = Flask(__name__)
  CORS(app)
  
  @app.route('/predict', methods=['POST'])
  def predict():
      data = request.json
      print(data)
      prompt = data['prompt']
      response = index.query(prompt)
      return jsonify({'response': response})
  
  if __name__ == '__main__':
      authorize_gdocs()
      GoogleDocsReader = download_loader('GoogleDocsReader')
      gdoc_ids = ['xxxx']
      loader = GoogleDocsReader()
      documents = loader.load_data(document_ids=gdoc_ids)
      index = GPTSimpleVectorIndex(documents)
      app.run(port=8000)
  
apis: llama_index.GPTSimpleVectorIndex llama_index.download_loader
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