docs: def parse_from_environ(self, environ):
          """Parses the information from the environment as form data.
  
          :param environ: the WSGI environment to be used for parsing.
          :return: A tuple in the form ``(stream, form, files)``.
          """
          content_type = environ.get("CONTENT_TYPE", "")
          content_length = get_content_length(environ)
          mimetype, options = parse_options_header(content_type)
          return self.parse(get_input_stream(environ), mimetype, content_length, options)