unary interceptor isn't necessary

main.go

@@ -5,7 +5,6 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
-	"google.golang.org/grpc"
 	"io"
 	"log"
 	"net"
@@ -36,6 +35,7 @@ import (
 	grpc_proxy "github.com/mwitkow/grpc-proxy/proxy"
 	"github.com/pkg/profile"
 	dmp "github.com/sergi/go-diff/diffmatchpatch"
+	"google.golang.org/grpc"
 )
 
 // version contains the version number
@@ -158,7 +158,6 @@ func newGrpcProxy(cfg *config.Config, tlscfg *tls.Config) []grpc.ServerOption {
 	return []grpc.ServerOption{
 		grpc.CustomCodec(grpc_proxy.Codec()),
 		grpc.UnknownServiceHandler(handler),
-		grpc.UnaryInterceptor(proxyInterceptor.Unary),
 		grpc.StreamInterceptor(proxyInterceptor.Stream),
 		grpc.StatsHandler(statsHandler),
 	}

proxy/grpc_handler.go

@@ -99,27 +99,6 @@ func (p proxyStream) Context() context.Context {
 	return p.ctx
 }
 
-func (g GrpcProxyInterceptor) Unary(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
-	target, err := g.lookup(ctx, info.FullMethod)
-
-	if err != nil {
-		return nil, err
-	}
-
-	ctx = context.WithValue(ctx, targetKey{}, target)
-
-	start := time.Now()
-
-	res, err := handler(ctx, req)
-
-	end := time.Now()
-	dur := end.Sub(start)
-
-	target.Timer.Update(dur)
-
-	return res, err
-}
-
 func (g GrpcProxyInterceptor) Stream(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
 	ctx := stream.Context()