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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.
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Gin
Gin is a HTTP web framework written in Go (Golang). It features a Martini-like API with much better performance -- up to 40 times faster. If you need smashing performance, get yourself some Gin.
If you purely build a rest api using core modules will get you pretty far. There are multiple small wrappers out there that provide better routing and possibly a nicer api. As an example https://github.com/go-chi/chi is only 1K LOC and compatible with handleFunc.
I tried once to only use the standard library for a REST-like api and ended removing all that code and replacing it with a framework (Echo in my case) once i noticed that all that those thousands lines of code that i wrote to handle errors, requests, responses, validations, etc were almost the same to the ones you could find it those frameworks.
Check gin-gonic. This is a powerfull web framework written in go.