title: How to extract some value from cookie in nginx
body: <p>I am new to Nginx and hope to get some help. </p>
  
  <p>I want to extract certain data (certain fields set by my PHP scripts) from browser cookie in nginx so that I can log it. If possible, I want to do this just by modifying nginx configuration. </p>
  
  <p>Any pointer/help would be greatly appreciated.</p>