def _insert_footer(self, response):
if not isinstance(response, FileResponse) or not self.tail_snippet:
return response
filepath = response._path
ct, encoding = mimetypes.guess_type(str(response._path))
if ct != 'text/html':
return response
with filepath.open('rb') as f:
body = f.read() + self.tail_snippet
resp = Response(body=body, content_type='text/html')
resp.last_modified = filepath.stat().st_mtime
return resp