title: How to set content-type in Rest Client step
body: <p>I'm using the Rest Client as below,</p>
  
  <p><a href="https://i.stack.imgur.com/xDGaQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xDGaQ.png" alt="Error"></a></p>
  
  <p>But every time I have the same error message </p>
  
  <blockquote>
    <p>HTTP Error 400. The request has an invalid header name.</p>
  </blockquote>
  
  <p>When I use the same config in postman client, (Content-Type:application/x-www-form-urlencoded) I've success message. </p>
  
  <p>What I have to do ? </p>