title: TypeError: Only absolute URLs are supported using env file with fetch
body: <p>I'm trying to use node-fetch to do a GET request. I'm using dotenv to take the url, but the fetch retrieve me <code>TypeError: Only absolute URLs are supported</code>, the <code>URL_ENV</code> variable isn't undefined</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-js lang-js prettyprint-override"><code>require('dotenv').config();
  let url = process.env.URL_ENV;
          fetch(url ,{method: 'GET'}).then(response =&gt; {
              return response.json() 
           })</code></pre>
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  </p>
  
  <p>If I change the url variable with the content of the <code>URL_ENV</code>inside the .env file it works</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>let url = "http://192.168.1.140:8080"
          fetch(url,{method: 'GET'}).then(response =&gt; {
              return response.json()
          })</code></pre>
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  </p>