API CORS Policy

Name: API CORS Policy
Availability: InStock
Author: Bytetalent

Configure CORS headers for API endpoints with restricted origins and methods.

Updated Apr 30, 2026

Search Tags:#performance #API #security #HTTP #CORS

Ready to run

npx skills add https://github.com/bytetalent/docs --skill api-cors-policy

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Please help me install this Agent Skill.
Skill: API CORS Policy
Source: https://github.com/bytetalent/docs/tree/main/skills/api/api-cors-policy
Command: npx skills add https://github.com/bytetalent/docs --skill api-cors-policy

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) components.

What problem does it solve?

This Skill addresses the issue of improper CORS configuration in API endpoints, which can lead to security vulnerabilities and performance issues.

Core Features & Use Cases

Prevent Wildcard Origins: Ensures that wildcard origins are not used for credentialed requests, enhancing security.
Restrict Methods: Limits the allowed HTTP methods to those the endpoint actually serves, reducing unnecessary requests.
Preflight Cache: Sets Access-Control-Max-Age to reduce preflight request overhead.
Use Case: For an API that serves both public and internal clients, this Skill ensures that CORS headers are correctly configured to allow secure cross-origin requests.

Quick Start

Set up CORS for your API endpoint using the API CORS Policy Skill by defining the allowed origins and methods in your environment variables.

Frequently Asked Questions about API CORS Policy

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I configure CORS headers to prevent unauthorized cross-origin API requests?▼

Configuring CORS headers prevents unauthorized cross-origin API requests by enumerating specific allowed origins and restricting HTTP methods. This ensures only authorized clients can access your endpoints while blocking wildcard origin vulnerabilities.

Why should I avoid wildcard origins for credentialed API requests?▼

Avoiding wildcard origins for credentialed API requests prevents security vulnerabilities by ensuring only explicitly defined domains can access authenticated endpoints. Wildcard configurations allow any origin to execute cross-origin requests with credentials, exposing sensitive data.

How do I reduce preflight request overhead for my API?▼

Reduce preflight request overhead by setting the Access-Control-Max-Age header in your CORS configuration. This caches preflight responses, preventing browsers from repeatedly sending OPTIONS requests before the actual cross-origin API call.

What HTTP methods should I allow in my CORS policy?▼

Allow only the HTTP methods your API endpoint actually serves in your CORS policy. Restricting methods to those strictly required, such as GET or POST, reduces unnecessary requests and minimizes the attack surface of your cross-origin endpoints.

Can I use this CORS configuration for both public and internal API endpoints?▼

Yes, you can use this CORS configuration for both public and internal API endpoints. It specifically ensures correct cross-origin header application across mixed client environments, allowing secure access for public and internal services alike.