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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It seemed to me that it was trying to access those endpoints in the server (and failing, obviously, because there were no GET methods defined there) instead of rendering the index.html. So, looking at a repo describing a successful deploy of a MERN app to Heroku, I found this line and it solved this particular issue for me.
NOTE:
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Hence, a higher number means a more popular project.