Recommended Security Headers for Web Applications with GitHub Copilot

To enhance the security of your web application, consider implementing the following HTTP security headers:

1. **Content-Security-Policy (CSP)**: Restricts sources for content like JavaScript, CSS, and images. Helps mitigate XSS and data injection attacks. Example: `Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted-source.com;`

2. **X-Content-Type-Options**: Prevents the browser from interpreting files as a different MIME type than what is specified by the content type in the HTTP headers. Example: `X-Content-Type-Options: nosniff`

3. **X-Frame-Options**: Protects against clickjacking attacks. Example: `X-Frame-Options: DENY` or `X-Frame-Options: SAMEORIGIN`

4. **Strict-Transport-Security (HSTS)**: Enforces secure (HTTP over SSL/TLS) connections to the server. Example: `Strict-Transport-Security: max-age=31536000; includeSubDomains`

5. **X-XSS-Protection**: Enables the Cross-site Scripting (XSS) filter built into most recent web browsers. Example: `X-XSS-Protection: 1; mode=block`

6. **Referrer-Policy**: Controls the amount of referral information sent along with requests. Example: `Referrer-Policy: no-referrer-when-downgrade`

7. **Feature-Policy**: Allows you to control which features and APIs can be used in the browser. Example: `Feature-Policy: geolocation 'self'; microphone 'none'`

8. **Permissions-Policy** (formerly known as Feature-Policy): Controls which web platform features can be used and in what contexts. Example: `Permissions-Policy: accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()`

Implementing these headers can significantly reduce the risk of common web vulnerabilities. Ensure to customize values based on your application's requirements and test thoroughly to ensure that functionality is not adversely affected.