Hi there. Hope you are having a great week. We've got lot's of big news so we will get right to it! Prerendering is the answer to SEO concerns for single page apps not behind login, and Netlify has built-in this feature now. If using a plan that supports prerendering, just check the "Prerender" checkbox from site settings and save. Prerendered pages are cached for 24 hours. Our open source build image now comes with a small build script to test builds locally under exact same conditions as on build machines. Netlify's domain alias feature allows multiple domains or subdomains to resolve to the same website, with flexible rewrite rules to handle different subdomains as folders within the same site.