title: How to turn off Netty library debug output?
body: <p>I am using Netty (via the Ning async HTTP <a href="http://www.ning.com/code/2010/03/introducing-nings-asynchronous-http-client-library/">library</a>) to retrieve documents via HTTP. This produces a huge amount of debug output the console, as listed below for a single document request.</p>
  
  <p>Anyone know how to turn this off? I really don't need to see this output.</p>
  
  <p>I'm calling from Scala, if that makes any difference.</p>
  
  <pre><code>15:07:14.273 [run-main] DEBUG c.n.h.c.p.n.NettyAsyncHttpProvider - 
  Non cached request 
  DefaultHttpRequest(chunked: false)
  GET /api/search.json?q=foo HTTP/1.1
  Host: www.documentcloud.org
  Connection: keep-alive
  Accept: */*
  User-Agent: NING/1.0
  
  using Channel 
  [id: 0x2839ca40]
  
  15:07:14.930 [New I/O client worker #1-1] DEBUG c.n.h.c.p.n.NettyAsyncHttpProvider - 
  
  Request DefaultHttpRequest(chunked: false)
  GET /api/search.json?q=foo HTTP/1.1
  Host: www.documentcloud.org
  Connection: keep-alive
  Accept: */*
  User-Agent: NING/1.0
  
  Response DefaultHttpResponse(chunked: true)
  HTTP/1.1 200 OK
  Content-Type: application/json; charset=utf-8
  Content-Length: 10477
  Connection: keep-alive
  Vary: Accept-Encoding
  Status: 200
  X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 3.0.13
  ETag: "4f8f766d639dd84d014dfee3abb45de2"
  X-Runtime: 611
  Cache-Control: private, max-age=0, must-revalidate
  Server: nginx/1.2.1 + Phusion Passenger 3.0.13 (mod_rails/mod_rack)
  
  15:07:14.941 [New I/O client worker #1-1] DEBUG c.n.h.c.p.netty.NettyConnectionsPool - Adding uri: http://www.documentcloud.org:80 for channel [id: 0x2839ca40, /10.5.165.61:56133 =&gt; www.documentcloud.org/75.101.159.206:80]
  
  15:07:16.921 [New I/O client worker #1-1] DEBUG c.n.h.c.p.n.NettyAsyncHttpProvider - Channel Closed: [id: 0x2839ca40, /10.5.165.61:56133 :&gt; www.documentcloud.org/75.101.159.206:80] with attachment com.ning.http.client.providers.netty.NettyAsyncHttpProvider$DiscardEvent@63182c3d
  15:08:13.924 [Timer-0] DEBUG c.n.h.c.p.netty.NettyConnectionsPool - Entry count for : http://www.documentcloud.org:80 : 0
  </code></pre>