https://angularfirebase.com/lessons/seo-angular-part-1-rendertron-meta-tags/
https://github.com/GoogleChrome/rendertron
https://github.com/GoogleChrome/rendertron/tree/master/middleware
https://technicalseo.com/seo-tools/fetch-render/
https://cards-dev.twitter.com/validator
https://github.com/monperrus/crawler-user-agents
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Show twitter card with/without rendertron
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Bug Opengraph
ng build --prod
node server.js
ngrok http 8080
== Rendertron
docker start rendertron-container
docker run -it -p 8080:8080 --security-opt seccomp=$HOME/chrome.json --name rendertron-container yamitzky/rendertron
https://github.com/jessfraz/dotfiles/blob/master/etc/docker/seccomp/chrome.json
== Rendertron middleware
== User agents
== Robots.txt
== Sitemaps.xml