// +build !go1.13packagetlsconfigimport("crypto/tls")// allTLSVersions lists all the TLS versions and is used by the code that validates// a uint16 value as a TLS version.varallTLSVersions=map[uint16]struct{}{tls.VersionTLS10:{},tls.VersionTLS11:{},tls.VersionTLS12:{},}