Slow down suspicious requests
Define a delay to be used when incoming requests match a rule you consider suspicious based on the bot score.
export default {  async fetch(request) {    // Define delay    const delay_in_seconds = 5;    // Introduce a delay    await new Promise((resolve) =>      setTimeout(resolve, delay_in_seconds * 1000),    ); // Set delay in milliseconds
    // Pass the request to the origin    const response = await fetch(request);    return response;  },};Configure a custom filter expression:
| Field | Operator | Value | 
|---|---|---|
| Bot Score | less than | 10 | 
If you are using the Expression Editor, enter the following expression:
(cf.bot_management.score lt 10)Was this helpful?
- Resources
 - API
 - New to Cloudflare?
 - Products
 - Sponsorships
 - Open Source
 
- Support
 - Help Center
 - System Status
 - Compliance
 - GDPR
 
- Company
 - cloudflare.com
 - Our team
 - Careers
 
- 2025 Cloudflare, Inc.
 - Privacy Policy
 - Terms of Use
 - Report Security Issues
 - Trademark