title: vue-cli3 Could not proxy request
body: <p>when I run <strong>npm run start</strong>, I get</p>
  
  <pre><code>start": "vue-cli-service serve"
  </code></pre>
  
  <p>and then I use http request, but I get</p>
  
  <blockquote>
    <p>Proxy error: Could not proxy request /crm/api/boss/admin/doLogin from
    localhost:8080 to <a href="https://qa6boss.qjdchina.com" rel="nofollow noreferrer">https://qa6boss.qjdchina.com</a>. See
    <a href="https://nodejs.org/api/errors.html#errors_common_system_errors" rel="nofollow noreferrer">https://nodejs.org/api/errors.html#errors_common_system_errors</a> for
    more information (EPROTO).</p>
  </blockquote>
  
  <p>What is the reason of this behavior?</p>