code: func GeneratePurgeURLs(der []byte, issuer *x509.Certificate) ([]string, error) {
  	cert, err := x509.ParseCertificate(der)
  	if err != nil {
  		return nil, err
  	}
  
  	req, err := ocsp.CreateRequest(cert, issuer, nil)
  	if err != nil {
  		return nil, err
  	}
  
  	// Create a GET and special Akamai POST style OCSP url for each endpoint in cert.OCSPServer
  	urls := []string{}
  	for _, ocspServer := range cert.OCSPServer {
  		if !strings.HasSuffix(ocspServer, "/") {
  			ocspServer += "/"
  		}
  		// Generate GET url
  		urls = append(generateOCSPCacheKeys(req, ocspServer))
  	}
  	return urls, nil
  }
docs: // GeneratePurgeURLs ...