4 Security Headers Every Website Should Have

Headers are an essential part of HTTP requests and responses, providing metadata about the data being transmitted. In the context of web security, certain headers play critical roles in enhancing website security by mitigating various types of attacks and protecting user privacy. Here’s a detailed look at four crucial security headers: Content-Security-Policy, X-Frame-Options, Strict-Transport-Security, and Referrer-Policy.

1. Content-Security-Policy (CSP)

Purpose: The CSP header helps prevent Cross-Site Scripting (XSS) and data injection attacks by specifying which sources of content are trusted.

How to Use:

• Directive Example:

  plaintext
   
  1Content-Security-Policy: default-src 'self'; script-src 'self' https://trustedscripts.example.com; object-src 'none'

• Explanation:
  • default-src: Sets the default policy for all content types.
  • script-src: Specifies trusted sources of JavaScript.
  • object-src 'none': Disallows plugins like Flash or Java.

Checking with curl:

bash
 
1curl -I https://yourdomain.com | grep Content-Security-P
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3[Read the full article at DEV Community](https://dev.to/jonathan_pimperton_971ac1/4-security-headers-every-website-should-have-346k)
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