code: def render_file(self, context, result):
  		
  		if __debug__:
  			log.debug("Processing file-like object.", extra=dict(request=id(context), result=repr(result)))
  		
  		response = context.response
  		response.conditional_response = True
  		
  		modified = mktime(gmtime(getmtime(result.name)))
  		
  		response.last_modified = datetime.fromtimestamp(modified)
  		ct, ce = guess_type(result.name)
  		if not ct: ct = 'application/octet-stream'
  		response.content_type, response.content_encoding = ct, ce
  		response.etag = unicode(modified)
  		
  		result.seek(0, 2)  # Seek to the end of the file.
  		response.content_length = result.tell()
  		
  		result.seek(0)  # Seek back to the start of the file.
  		response.body_file = result
  		
  		return True
docs: Perform appropriate metadata wrangling for returned open file handles.