title: Node.js, express, and using development versus production in app.configure
body: <p>What is the easiest method to let express know what environment I am in?  E.g. I want do do the below to make a connection to redis depending on what env I am in.  Can this be done from the command line?</p>
  
  <pre><code>app.configure('development', function(){
    app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
    var r = require("redis").createClient(6379,'127.0.0.1');
  });
  app.configure('production', function(){
    app.use(express.errorHandler());
    r = redis.createClient(6379,'46.137.195.230', { detect_buffers: true });
  });
  </code></pre>