Imports golang.org/x/net/context github.com/coredns/coredns/core/dnsserver github.com/coredns/coredns/middleware github.com/mholt/caddy github.com/miekg/dns github.com/opentracing/opentracing-go github.com/openzipkin/zipkin-go-opentracing Standard library imports strconv strings sync sync/atomic fmt