This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Secure HTTP Headers


Harden your web applications.

HTTP header fields are components of the header section of request and response messages. The headers define the operating parameters of an HTTP transaction.

Securing HTTP headers will improve the resilience of your web application against many common attacks including those that are on the OWASP top 10 list.

Securing headers can also improve your SEO rank and in addition to preventing websites from being marked as dangerous by browsers and antivirus applications.

Protect sensitive user information and be compliant with privacy regulations. Defend users from stealing private data by protecting website cookies. Use the proper directive such as “secure”, “httponly” and “samesite”, all of those will be applied automatically by “Secure HTTP Headers” plugin.

Secure HTTP Headers will automatically analyze any website and will build up secure headers directives, by the latest best practice.

In addition, Secure HTTP Headers offers fully configurable options, apply or skip any header directive as needed.

Install and activate Secure HTTP Headers with full confidence, the deactivation of this plugin will return your website header directives to their original state.

Main plugin functionality

  1. HTTP Strict Transport Security – helps to protect websites against man-in-the-middle attacks and cookie hijacking

  2. X-Frame-Options – helps to protect users against ClickJacking attacks

  3. X-Content-Type-Options – helps to prevent the browser from MIME-sniffing

  4. Referrer-Policy – helps to control how much referrer information should be included with requests

  5. Clear-Site-Data – helps to ensure that data is deleted from the browser if the user logs out

  6. X-Download-Options – helps to control how IE 8 will handle downloaded HTML files

  7. Access-Control-Allow-Origin – helps to ensure whether the response can be shared with requesting code from the given origin

  8. Cross-Origin-Embedder-Policy – helps to prevent a document from loading any cross-origin resources that don’t explicitly grant the document permission

  9. Permissions-Policy – helps to allow and deny the use of browser features in its own frame, and in content within any iframe elements in the document

  10. Cross-Origin-Opener-Policy – helps to protect websites against a set of cross-origin attacks dubbed XS-Leaks

  11. Cross-Origin-Resource-Policy – helps to protect websites against speculative side-channel attacks, like Spectre, as well as Cross-Site Script Inclusion attacks

  12. X-Permitted-Cross-Domain-Policies – helps to control how cross-domain requests from Flash and PDF documents are handled

  13. Cookie Http-Only flag – helps to protect websites against Cross-Site Scripting, or XSS attacks

  14. Cookie Secure flag – helps to ensure that cookie is sent over a secure connection

  15. Cookie Samesite Lax flag – helps to protect websites against CSRF and XSSI attacks

  16. Expect-CT – helps to prevent the use of misissued certificates for a website. Note: The Expect-CT will likely become obsolete in June 2021

What are the optional extras?

Magnisec is offering “Secure HTTP Headers enhanced”

A plugin that contains, in addition, an engine that watches and builds in any website changes a CSP – Content Security Policy that is best practice and recommended by all professional securities experts, that mitigate XSS -Cross site Scripting, one of the most common and destructive attacks.

Price: 50$ /year for a domain.

More details and installation here


  • In the left sidebar menu, navigate to Settings > Secure HTTP Headers and choose your website’s server
  • Click the button “Recommended configuration” or choose your custom configuration
  • If your server is NGINX, follow directions for securing your website


  1. Upload plugin files to your plugins folder, or install using WordPress built-in Add New Plugin installer
  2. Activate the plugin
  3. Choose a custom configuration or select recommended one.


What will happen if I deactivate Secure HTTP Headers?

Your initial configuration will restore with no change.


11 Meán an tSamhraidh, 2021
This plugin has not been thoroughly tested. It caused a code 500 error on our Wordpress installation (good thing it was just staging!), making the site and admin panel inaccessible. Please pull this out of the plugin market as this needs to be tested alongside different security plugins as well.
5 Meán an tSamhraidh, 2021
Thank you for developing this plugin. Combined with another plugin, the default configuration is helping to get the ‘A’ rating I was looking for from the url test.
Read all 2 reviews

Contributors & Developers

“Secure HTTP Headers” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Initial Version.