code: def get_content_type(filename):
      return (
          mimetypes.guess_type(filename)[0]
          or "application/octet-stream"
      )
  
imports: import cgi
  import http.client
  import json
  import logging
  import mimetypes
  import os
  import tempfile
  from urllib.parse import quote_plus, urlparse
  import requests
label_desc: Use image node_id 7 for calling the MONAILabelUtils obj's underlying member method code with example usage: obj.get_content_type(filename) and returns: unknown