Host Wildcard Subdomain in One S3 Bucket https://blackbing.medium.com/host-wildcard-subdomain-in-one-s3-bucket-with-lambda-edge-979c7cb282dc

Host-Wildcard-Subdomain-in-One-S3-Bucket-origin-request.js

'use strict';

exports.handler = (event, context, callback) => {
    const request = event.Records[0].cf.request;
    const headers = request.headers;
    const domainHash = headers['x-domain-hash'] && headers['x-domain-hash'][0].value;
    if (domainHash) {
        request.uri = '/' + domainHash + request.uri;
    }
    return callback(null, request);
};