fix: sidecar proxy http request report "use of closed network connect…

…ion"

go.mod

@@ -3,6 +3,7 @@ module tkestack.io/kvass
 go 1.15
 
 require (
+	github.com/cssivision/reverseproxy v0.0.1
 	github.com/gin-contrib/pprof v1.3.0
 	github.com/gin-gonic/gin v1.6.3
 	github.com/go-kit/kit v0.10.0

go.sum

@@ -166,6 +166,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
 github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
+github.com/cssivision/reverseproxy v0.0.1 h1:IvhNE3XITZOWFhON2faKbrDeGpqa+yfessLQKSSt15U=
+github.com/cssivision/reverseproxy v0.0.1/go.mod h1:+QTeWrlVNQDAiB3pnaecTCk5rh1sS3cJltUl/+L2APg=
 github.com/dave/jennifer v1.2.0/go.mod h1:fIb+770HOpJ2fmN9EPPKOqm1vMGhB+TwXKMZhrIygKg=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=

pkg/sidecar/service.go

@@ -18,11 +18,11 @@
 package sidecar
 
 import (
+	"github.com/cssivision/reverseproxy"
 	"github.com/gin-contrib/pprof"
 	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
 	"net/http"
-	"net/http/httputil"
 	"net/url"
 	"tkestack.io/kvass/pkg/api"
 	"tkestack.io/kvass/pkg/prom"
@@ -88,7 +88,7 @@ func (s *Service) ServeHTTP(wt http.ResponseWriter, r *http.Request) {
 	}
 
 	u, _ := url.Parse(s.promURL)
-	httputil.NewSingleHostReverseProxy(u).ServeHTTP(wt, r)
+	reverseproxy.NewReverseProxy(u).ServeHTTP(wt, r)
 }
 
 // Run start Service at "address"