class_docstr: Returns ForwardMsgs from our MessageCache
docstr: /OPTIONS handler for preflight CORS checks.
docstr_tok: ["\/OPTIONS","handler","for","preflight","CORS","checks","."]
code: def options(self):
      """/OPTIONS handler for preflight CORS checks."""
      self.set_status(204)
      self.finish()
  
imports: import os
  import tornado.web
  from streamlit import config, file_util
  from streamlit.logger import get_logger
  from streamlit.runtime.runtime_util import serialize_forward_msg
  from streamlit.web.server.server_util import emit_endpoint_deprecation_notice
label_desc: Use image node_id 4 for calling the MessageCacheHandler obj's underlying member method code with example usage: obj.options() without return types