diff --git a/README.md b/README.md
index f1497d0..a61e8ec 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ A global proxy for go modules. see: [https://goproxy.io](https://goproxy.io)
 
 ## Requirements
     It invokes the local go command to answer requests.
+    The default cacheDir is GOPATH, you can set it up by yourself according to the situation.
 
 ## Build
     git clone https://github.com/goproxyio/goproxy.git
@@ -18,6 +19,9 @@ A global proxy for go modules. see: [https://goproxy.io](https://goproxy.io)
     
     ./bin/goproxy -listen=0.0.0.0:80 -cacheDir=/tmp/test
 
+    If you run `go get -v pkg` in the proxy machine, should set a new GOPATH which is not different from the old GOPATH, or mayebe deadlock.
+    See the file test/get_test.sh.
+
 ### Router mode    
 
 Use the -proxy flag switch to "Router mode", which 
diff --git a/go.mod b/go.mod
index 251162e..6f38513 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/goproxyio/goproxy
+module github.com/goproxyio/goproxy/v2
 
 go 1.12
 
diff --git a/main.go b/main.go
index 53d4e82..96d035d 100644
--- a/main.go
+++ b/main.go
@@ -33,7 +33,7 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/goproxyio/goproxy/proxy"
+	"github.com/goproxyio/goproxy/v2/proxy"
 
 	"golang.org/x/mod/module"
 )
@@ -66,6 +66,9 @@ func init() {
 		os.Setenv("GOPRIVATE", excludeHost)
 	}
 
+	// Enable Go module
+	os.Setenv("GO111MODULE", "on")
+
 	downloadRoot = getDownloadRoot()
 }
 
@@ -116,7 +119,7 @@ func getDownloadRoot() string {
 	}
 	if cacheDir != "" {
 		os.Setenv("GOPATH", cacheDir)
-		return filepath.Join(cacheDir, "pkg/mod/cache/download")
+		return filepath.Join(cacheDir, "pkg", "mod", "cache", "download")
 	}
 	if err := goJSON(&env, "go", "env", "-json", "GOPATH"); err != nil {
 		log.Fatal(err)
@@ -125,7 +128,7 @@ func getDownloadRoot() string {
 	if len(list) == 0 || list[0] == "" {
 		log.Fatalf("missing $GOPATH")
 	}
-	return filepath.Join(list[0], "pkg/mod/cache/download")
+	return filepath.Join(list[0], "pkg", "mod", "cache", "download")
 }
 
 // goJSON runs the go command and parses its JSON output into dst.
@@ -174,7 +177,7 @@ func (*ops) List(ctx context.Context, mpath string) (proxy.File, error) {
 	if err != nil {
 		return nil, err
 	}
-	file := filepath.Join(downloadRoot, escMod+"/@v/listproxy")
+	file := filepath.Join(downloadRoot, escMod, "@v", "list")
 	if info, err := os.Stat(file); err == nil && time.Since(info.ModTime()) < listExpire {
 		return os.Open(file)
 	}
diff --git a/proxy/router.go b/proxy/router.go
index a6663df..33a745e 100644
--- a/proxy/router.go
+++ b/proxy/router.go
@@ -15,7 +15,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/goproxyio/goproxy/renameio"
+	"github.com/goproxyio/goproxy/v2/renameio"
 )
 
 const ListExpire = 5 * time.Minute
@@ -115,11 +115,25 @@ func (rt *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		rt.srv.ServeHTTP(w, r)
 		return
 	}
+
 	file := filepath.Join(rt.downloadRoot, r.URL.Path)
 	if info, err := os.Stat(file); err == nil {
 		if f, err := os.Open(file); err == nil {
 			var ctype string
 			defer f.Close()
+			if strings.HasSuffix(r.URL.Path, "/@latest") {
+				if time.Since(info.ModTime()) >= ListExpire {
+					log.Printf("------ --- %s [proxy]\n", r.URL)
+					rt.proxy.ServeHTTP(w, r)
+				} else {
+					ctype = "text/plain; charset=UTF-8"
+					w.Header().Set("Content-Type", ctype)
+					log.Printf("------ --- %s [cached]\n", r.URL)
+					http.ServeContent(w, r, "", info.ModTime(), f)
+				}
+				return
+			}
+
 			i := strings.Index(r.URL.Path, "/@v/")
 			if i < 0 {
 				http.Error(w, "no such path", http.StatusNotFound)
diff --git a/renameio/renameio.go b/renameio/renameio.go
index 5d08f6b..6a02991 100644
--- a/renameio/renameio.go
+++ b/renameio/renameio.go
@@ -13,7 +13,7 @@ import (
 	"path/filepath"
 	"strconv"
 
-	"github.com/goproxyio/goproxy/robustio"
+	"github.com/goproxyio/goproxy/v2/robustio"
 )
 
 const patternSuffix = ".tmp"
diff --git a/renameio/renameio_test.go b/renameio/renameio_test.go
index 172df35..14f419d 100644
--- a/renameio/renameio_test.go
+++ b/renameio/renameio_test.go
@@ -20,7 +20,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/goproxyio/goproxy/robustio"
+	"github.com/goproxyio/goproxy/v2/robustio"
 )
 
 func TestConcurrentReadsAndWrites(t *testing.T) {
diff --git a/test/get_test.sh b/test/get_test.sh
index 10212b7..d1fb500 100755
--- a/test/get_test.sh
+++ b/test/get_test.sh
@@ -2,6 +2,7 @@
 
 export GO111MODULE=on
 export GOPROXY='http://127.0.0.1:8081'
+export GOPATH=/tmp/go
 
 datafile='test/testdata/get.txt'