'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)``.'

def parse_from_environ(self, environ):

    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)
