title: pyspider phantom is not enabled ;501 Sever Error
body: <p>I used pyspider to crawl a website, when using PhantomJs, an error occurred as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/qqht3.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/2RX8W.jpg" alt="enter image description here"></p>
  
  <p>I've searched for the solutions in <a href="https://github.com/binux/pyspider/issues/215" rel="nofollow noreferrer">https://github.com/binux/pyspider/issues/215</a>, 
  the author's seemed to solute it, so I tried, but it didn't still. How to solve it?</p>
  
  <p><img src="https://i.stack.imgur.com/MS33G.jpg" alt="enter image description here"></p>