Lambda@Edge origin-request trigger to change HTTP Host Header.

rewrite-host-header-index.js

'use strict';

exports.handler = (event, context, callback) => {
    console.log('event:' + JSON.stringify(event));

    // Get contents of request
    const request = event.Records[0].cf.request;
    // Rewrite
    request.headers.host[0].value = '${rewrite_value}';
    console.log('request headers:' + JSON.stringify(request.headers));

    return callback(null, request);
}