docs: def gzip_cache(path):
      """
      Another GZIP handler for Bottle functions. This may be used to cache the
      files statically on the disc on given `path`.
  
      If the browser accepts GZIP and there is file at ``path + ".gz"``, this
      file is returned, correct headers are set (Content-Encoding, Last-Modified,
      Content-Length, Date and so on).
  
      If the browser doesn't accept GZIP or there is no ``.gz`` file at same
      path, normal file is returned.
  
      Args:
          path (str): Path to the cached file.
  
      Returns:
          obj: Opened file.
      """
      accept_enc = request.get_header("Accept-Encoding")
  
      if accept_enc and "gzip" in accept_enc and os.path.exists(path + ".gz"):
          path = path + ".gz"
          response.set_header("Content-Encoding", "gzip")
  
      stats = os.stat(path)
  
      headers = dict()
      headers['Content-Length'] = stats.st_size
      headers['Last-Modified'] = time.strftime(
          "%a, %d %b %Y %H:%M:%S GMT",
          time.gmtime(stats.st_mtime)
      )
  
      # I need to set `headers` dict for optional HTTPResponse use, but also set
      # hedears using `response.set_header()` for normal use
      for key, val in headers.iteritems():
          response.set_header(key, val)
  
      modified_since = request.environ.get('HTTP_IF_MODIFIED_SINCE')
      if modified_since:
          modified_since = parse_date(modified_since.split(";")[0].strip())
  
      if modified_since is not None and modified_since >= int(stats.st_mtime):
          headers['Date'] = time.strftime(
              "%a, %d %b %Y %H:%M:%S GMT",
              time.gmtime()
          )
          return HTTPResponse(status=304, **headers)
  
      return open(path)