title: How to get the header content from *fasthttp.Request of Golang?
body: <blockquote>
    <p>As the title says , is there an api for that?</p>
  </blockquote>
  
  <pre><code>*fasthttp.Request.Header.key 
  </code></pre>
  
  <blockquote>
    <p>When I call the method with POSTMAN , I can't get the header content key as the above code . Why</p>
  </blockquote>