code: def set_default_headers(self):
      # CORS protection is disabled because we need access to this endpoint
      # from the inner iframe.
      self.set_header("Access-Control-Allow-Origin", "*")
  
file_path: streamlit/lib/streamlit/web/server/app_static_file_handler.py
imports: import mimetypes
  import os
  from pathlib import Path
  from typing import Optional
  import tornado.web
  from streamlit.logger import get_logger
label_desc: Use image node_id 3 for calling the AppStaticFileHandler obj's underlying member method code with example usage: obj.set_default_headers() without return types