Recently I was testing a client-side algorithm that pulled a lot of data from the server and I thought my http server might have been the bottleneck, and so I s

Recently I was testing a client-side algorithm that pulled a lot of data from the server and I thought my http server might have been the bottleneck, and so I spun up a few copies of the server but had to enable cors to get the client talking to them all. Newbs like me don't realise that localhost+cors = exposed to the www, so this article was very surprising and useful. This app is only used internally and so your deployment justification doesn't make sense for this case, but I will definitely make sure only specific domains are exempted in the future, thanks to this article.