title: Unset NODE_DEBUG variable
body: <p>I set <code>NODE_DEBUG</code> environment variable to <code>request</code>:</p>
  
  <pre><code>export NODE_DEBUG=request
  </code></pre>
  
  <p>Now I want to unset it.</p>
  
  <pre><code>export NODE_DEBUG=""
  </code></pre>
  
  <p>I tried the command above, but the Node processes still output request debug messages.</p>
  
  <p>Did I do something wrong? How can I prevent messages like below?</p>
  
  <pre><code>REQUEST:  { host: 'api......com',
    port: ...,
    path: '/...',
    method: 'get',
    headers: 
     {...}
  STATUS: 200
  HEADERS: {...}
  </code></pre>