如何使网络.浏览器.浏览的日志静音到标准输出?

我在用 Network.Browser 4000.0.9检索网页:

import Network.Browser
import Network.HTTP

main =
  do
    (uri, response) <- browse $ do
      setAllowRedirects True
      setDebugLog Nothing
      request $ getRequest "http://www.google.com/robots.txt"
    putStrLn "done"

尽管 setDebugLog Nothing 所有这些日志记录都是这样的:

Sending:
GET /robots.txt HTTP/1.1
Host: www.google.com
User-Agent: ...
Content-Length: 0


Creating new connection to www.google.com
Received:
HTTP/1.1 200 OK
Content-Type: text/plain
...

如何关闭此日志记录?