The “Permissions Policy Header Parse Failed” error occurs when a website sends an invalid or incorrectly formatted Permissions-Policy HTTP header. Modern browsers use this header to control which browser features, such as camera access, microphone usage, location services, or fullscreen, can be used by a webpage.
A syntax mistake, unsupported feature name, or incorrect formatting can cause the browser to reject the policy.
What Is The Permissions Policy Header?
The Permissions Policy header allows website owners to restrict browser features for security and privacy reasons.
Example:
Permissions-Policy: camera=(), microphone=()
This blocks camera and microphone access for the website.
The header replaced the older Feature-Policy header and uses a stricter syntax.
Common Causes Of Parse Errors
Several configuration mistakes can trigger this error.
Incorrect Quotation Marks
A common mistake is using the wrong format for allowed origins.
Incorrect:
Permissions-Policy: geolocation=*
Correct:
Permissions-Policy: geolocation=*
Some policies require quoted origins:
Permissions-Policy: geolocation=(self "https://example.com")
Using Deprecated Feature Names
Some feature names used in older Feature-Policy examples may no longer be supported.
Examples that may cause problems include:
Permissions-Policy: vibrate=()
or:
Permissions-Policy: payment=()
Always verify that the feature name is supported by modern browsers.
Incorrect Parentheses Syntax
Permissions Policy uses specific formatting rules.
Incorrect:
Permissions-Policy: camera=none
Correct:
Permissions-Policy: camera=()
An empty pair of parentheses means the feature is disabled.
Incorrect Multiple Feature Formatting
Each feature must be separated correctly.
Incorrect:
Permissions-Policy: camera=(), microphone=(), geolocation
Correct:
Permissions-Policy: camera=(), microphone=(), geolocation=()
Fix Permissions Policy In Apache .htaccess
If your website uses Apache, check your .htaccess file.
Example:
Header always set Permissions-Policy "camera=(), microphone=(), geolocation=()"
After editing, clear your website cache and test the header again.
Fix Permissions Policy In Nginx
For Nginx servers, add the header inside your server block.
Example:
add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
Restart or reload Nginx after making changes.
sudo nginx -t
sudo systemctl reload nginx
Fix Permissions Policy In WordPress
WordPress sites may receive this error from:
- Security plugins
- CDN settings
- Cache plugins
- Custom headers added in themes
- Server configurations
Check locations where headers are added:
- Security plugin settings
- Cloudflare rules
.htaccess- Hosting control panel
- Theme functions
Example WordPress code:
function add_permissions_policy_header() {
header("Permissions-Policy: camera=(), microphone=(), geolocation=()");
}
add_action('send_headers', 'add_permissions_policy_header');
How To Check Your Header
You can check the current Permissions Policy header using browser developer tools.
Steps:
- Open your website.
- Press F12.
- Open the Network tab.
- Reload the page.
- Select the main document request.
- Check Response Headers.
- Find:
Permissions-Policy
You can also test headers using command line:
curl -I https://example.com
Recommended Permissions Policy Configuration
A simple secure configuration for many websites is:
Permissions-Policy: camera=(), microphone=(), geolocation=(), payment=()
However, only disable features your website does not need. Blocking required permissions can break functionality such as video calls, maps, or payment systems.
Join The Discussion
Have you encountered browser security header errors while optimizing a website? Share your experience with Permissions Policy, security headers, and server configurations that helped you fix similar issues.
