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

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安全与测试

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

关于

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.

主要功能

Automated validation of essential CORS headers in Response objects
Guidance on preflight caching and performance optimization via Max-Age headers
Real-time alerts for security anti-patterns like wildcard origins with credentials
Detection of missing or incorrect OPTIONS method handlers for preflight requests
Environment-aware configuration recommendations for dynamic origin validation
2 GitHub stars

使用场景

Standardizing CORS implementation patterns across multiple edge functions
Debugging 'Blocked by CORS' errors during Cloudflare Workers development
Hardening API security by replacing wildcard origins with validated allow-lists

关于

主要功能

Automated validation of essential CORS headers in Response objects
Guidance on preflight caching and performance optimization via Max-Age headers
Real-time alerts for security anti-patterns like wildcard origins with credentials
Detection of missing or incorrect OPTIONS method handlers for preflight requests
Environment-aware configuration recommendations for dynamic origin validation
2 GitHub stars

使用场景

Standardizing CORS implementation patterns across multiple edge functions
Debugging 'Blocked by CORS' errors during Cloudflare Workers development
Hardening API security by replacing wildcard origins with validated allow-lists