Add a true client IP header to a CloudFront Functions viewer request event - Amazon CloudFront
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Add a true client IP header to a CloudFront Functions viewer request event

The following code example shows how to add a true client IP header to a CloudFront Functions viewer request event.

JavaScript
JavaScript runtime 2.0 for CloudFront Functions
Note

There's more on GitHub. Find the complete example and learn how to set up and run in the CloudFront Functions examples repository. 

async function handler(event) {
    var request = event.request;
    var clientIP = event.viewer.ip;

    //Add the true-client-ip header to the incoming request
    request.headers['true-client-ip'] = {value: clientIP};
    
    return request;
}

For a complete list of Amazon SDK developer guides and code examples, see Using CloudFront with an Amazon SDK. This topic also includes information about getting started and details about previous SDK versions.