How does this skill detect CORS issues?

It monitors code for new Response objects, API endpoint definitions, and header settings to identify missing or insecure CORS patterns in real-time.

Does it support specific Cloudflare Workers features?

Yes, it is specifically optimized for the Workers runtime, focusing on edge-specific patterns like environment-based origin validation and the Fetch API.

Does it handle preflight OPTIONS requests?

Yes, the skill explicitly checks for the presence of an OPTIONS method handler, which is required for many cross-origin POST, PUT, and DELETE requests.

Why is it flagging my use of wildcard '*' origins?

Using a wildcard with 'Access-Control-Allow-Credentials' set to true is a security risk and is often blocked by browsers. This skill suggests more secure, specific origin validation.

Can it help fix 'Access-Control-Allow-Origin' errors?

Absolutely. It identifies when headers are missing or improperly set and provides immediate code remediation to ensure browsers don't block your requests.

CORS Configuration Validator

Name: CORS Configuration Validator
Author: hirefrank

byhirefrank

•

セキュリティとテスト

Validates and secures Cloudflare Workers CORS configurations to ensure proper header handling and cross-origin security.

The CORS Configuration Validator skill acts as an automated auditor for Cloudflare Workers, identifying misconfigured CORS headers and missing preflight (OPTIONS) handlers in real-time. It helps developers avoid common pitfalls—such as overly permissive wildcards on authenticated APIs or missing cache headers—while providing instant remediation snippets. By enforcing best practices for origin validation and header combinations, it ensures cross-origin requests function correctly and securely across different deployment environments.

主な機能

01Automated validation of essential CORS headers in Response objects

02Guidance on preflight caching and performance optimization via Max-Age headers

03Real-time alerts for security anti-patterns like wildcard origins with credentials

04Detection of missing or incorrect OPTIONS method handlers for preflight requests

05Environment-aware configuration recommendations for dynamic origin validation

062 GitHub stars

ユースケース

01Standardizing CORS implementation patterns across multiple edge functions

02Debugging 'Blocked by CORS' errors during Cloudflare Workers development

03Hardening API security by replacing wildcard origins with validated allow-lists

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hirefrank/hirefrank-marketplace cors-configuration-validator

For use in Claude.ai and ChatGPT

Download Skill