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RESTCpp
Discontinued Cross Platform Multi threaded REST API / HTTP Server framework using thread-pooling implementation with modern C++
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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.
I'd be quite nervous trusting the hand-crafted HTTP-protocol parser: https://github.com/ozanarmagan/RESTCpp/blob/master/src/HTTPRequest.cpp
NOTE:
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Hence, a higher number means a more popular project.