Add security headers to the response - Amazon CloudFront
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Add security headers to the response

The following example function adds several common security-related HTTP headers to the response. For more information, see the following pages on the MDN Web Docs website:

This is a viewer response function.

See this example on GitHub.

JavaScript runtime 2.0
async function handler(event) {
    const response = event.response;
    const headers = response.headers;

    // Set HTTP security headers
    // Since JavaScript doesn't allow for hyphens in variable names, we use the dict["key"] notation 
    headers['strict-transport-security'] = { value: 'max-age=63072000; includeSubdomains; preload'}; 
    headers['content-security-policy'] = { value: "default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'; object-src 'none'; frame-ancestors 'none'"}; 
    headers['x-content-type-options'] = { value: 'nosniff'}; 
    headers['x-frame-options'] = {value: 'DENY'}; 
    headers['x-xss-protection'] = {value: '1; mode=block'};
    headers['referrer-policy'] = {value: 'same-origin'};
    
    // Return the response to viewers 
    return response;
}
JavaScript runtime 1.0
function handler(event) {
    var response = event.response;
    var headers = response.headers;

    // Set HTTP security headers
    // Since JavaScript doesn't allow for hyphens in variable names, we use the dict["key"] notation 
    headers['strict-transport-security'] = { value: 'max-age=63072000; includeSubdomains; preload'}; 
    headers['content-security-policy'] = { value: "default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'; object-src 'none'"}; 
    headers['x-content-type-options'] = { value: 'nosniff'}; 
    headers['x-frame-options'] = {value: 'DENY'}; 
    headers['x-xss-protection'] = {value: '1; mode=block'}; 

    // Return the response to viewers 
    return response;
}