title: charles remove query param value
body: <p>How to remove query param value in charles,but save the query param key?</p>
  
  <h3>origin</h3>
  
  <p><code>https://stackoverflow.com/questions/ask?title=charles&amp;key=1</code></p>
  
  <h3>expected</h3>
  
  <p><code>https://stackoverflow.com/questions/ask?title=&amp;key=1</code></p>
  
  <p>I set it in charles rewrite feature to replace query param value, but it can't working. When leave the replace value blank, it only refer the match origin value.</p>
  
  <p><a href="https://i.stack.imgur.com/7TSuN.png" rel="nofollow noreferrer">charles rewrite</a></p>