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"Package grace provides a library that makes it easy to build socket based servers that can be gracefully terminated & restarted (that is, without dropping any connections). It provides a convenient API for HTTP servers including support for TLS, especially if you need to listen on multiple ports (for example a secondary internal only admin server). Additionally it is implemented using the same API as systemd providing socket activation compatibility to also provide lazy activation of the server."
"The goagain package provides primitives for bringing zero-downtime restarts to Go applications that accept connections from a net.TCPListener or net.UnixListener."