A comprehensive technical utility for correctly implementing, debugging, and securing Cross-Origin Resource Sharing (CORS) in web environments.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install cors
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install cors using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is CORS Configuration and Security?
The CORS skill for Openclaw Skills is designed to eliminate the common security pitfalls and debugging frustrations associated with cross-origin requests. It provides a structured approach to managing preflight triggers, credential modes, and origin validation, ensuring that your web applications remain secure while allowing necessary resource sharing. By automating the identification of complex headers and methods that trigger preflight OPTIONS requests, this tool helps developers maintain high security standards without sacrificing functionality.
This skill is an essential addition to any developer's toolkit within Openclaw Skills, as it addresses critical server-side mistakes like improper wildcard usage and missing Vary headers. Whether you are dealing with cookies in credentials mode or managing exposed headers for client-side JavaScript, this resource provides the technical blueprints to implement CORS correctly every time.
CORS Configuration and Security Use Cases
- Resolving preflight OPTIONS request failures in production environments.
- Implementing secure dynamic origin validation to replace unsafe wildcards.
- Configuring cookie-based authentication across different subdomains or platforms.
- Optimizing API performance by managing preflight caching headers.
- Troubleshooting opaque fetch responses and missing custom headers in client-side scripts.
How CORS Configuration and Security Works
- The skill identifies if an incoming request triggers a preflight based on custom headers, specific methods, or request body types.
- It validates the request origin against a defined allowlist, avoiding common regex pitfalls like unanchored patterns.
- Appropriate Access-Control-Allow-Origin and Access-Control-Allow-Credentials headers are generated based on the validation result.
- It ensures the inclusion of the critical Vary: Origin header to prevent CDN caching issues.
- During the preflight stage, it sets optimal caching durations using Access-Control-Max-Age to reduce redundant OPTIONS traffic.
- Finally, it ensures that all headers are present even on error responses to allow the client to read diagnostic information.
CORS Configuration and Security Setup
To integrate this skill into your workflow using Openclaw Skills, follow these steps:
# Install the CORS configuration utility
openclaw install skill-cors-config
# Configure your origin allowlist
openclaw set-config cors.allowlist "['https://yourdomain.com', 'https://api.yourdomain.com']"
# Enable preflight caching for 24 hours
openclaw set-config cors.max_age 86400
CORS Configuration and Security Data Schema & Taxonomy
The skill manages CORS configurations using a structured data model to ensure consistency across environments:
| Attribute | Type | Description |
|---|---|---|
allowed_origins |
Array | A list of specific origins allowed to access the resources. |
allow_credentials |
Boolean | Determines if cookies and auth headers are permitted. |
expose_headers |
List | Custom headers that the client browser is permitted to read. |
max_age |
Integer | The duration (in seconds) the results of a preflight request can be cached. |
preflight_triggers |
Object | Map of methods and headers that require OPTIONS verification. |
CORS Configuration and Security Advanced Features
- Private Network Access support for secure localhost communication from public web domains.
- Automatic injection of CORS headers into 4xx and 5xx error handlers to prevent client-side debugging blocks.
- Intelligent dynamic origin reflection that verifies against an allowlist instead of using unsafe wildcards.
- Multi-agent compatibility for distributed microservices within the Openclaw Skills ecosystem.
- Automated validation of Vary headers to ensure caching correctness across proxies and CDNs.
SKILL.md
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