diff --git a/go.mod b/go.mod
index 2d6246ed7b..0803551be1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,7 +1,3 @@
 module golang.org/x/tools
 
-require (
-	golang.org/x/net v0.0.0-20190213061140-3a22650c66bd
-	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f // indirect
-	google.golang.org/appengine v1.4.0
-)
+require golang.org/x/net v0.0.0-20190213061140-3a22650c66bd
diff --git a/go.sum b/go.sum
index 24edbf4948..9fb0388d64 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,2 @@
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd h1:HuTn7WObtcDo9uEEU7rEqL0jYthdXAmZ6PP+meazmaU=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
-golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
diff --git a/playground/appengine.go b/playground/appengine.go
deleted file mode 100644
index 08c61f3d19..0000000000
--- a/playground/appengine.go
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2012 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build appengine
-
-package playground
-
-import (
-	"context"
-	"io"
-	"net/http"
-
-	"google.golang.org/appengine"
-	"google.golang.org/appengine/log"
-	"google.golang.org/appengine/urlfetch"
-)
-
-func init() {
-	onAppengine = !appengine.IsDevAppServer()
-}
-
-func contextFunc(r *http.Request) context.Context {
-	return appengine.NewContext(r)
-}
-
-func post(ctx context.Context, url, contentType string, body io.Reader) (*http.Response, error) {
-	return urlfetch.Client(ctx).Post(url, contentType, body)
-}
-
-func report(r *http.Request, err error) {
-	ctx := appengine.NewContext(r)
-	log.Errorf(ctx, "%v", err)
-}
diff --git a/playground/common.go b/playground/common.go
deleted file mode 100644
index 564aff1743..0000000000
--- a/playground/common.go
+++ /dev/null
@@ -1,67 +0,0 @@
-// Copyright 2013 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package playground registers HTTP handlers at "/compile" and "/share" that
-// proxy requests to the golang.org playground service.
-// This package may be used unaltered on App Engine.
-package playground // import "golang.org/x/tools/playground"
-
-import (
-	"bytes"
-	"context"
-	"errors"
-	"fmt"
-	"io"
-	"net/http"
-	"time"
-)
-
-const baseURL = "https://play.golang.org"
-
-func init() {
-	http.HandleFunc("/compile", bounce)
-	http.HandleFunc("/share", bounce)
-}
-
-func bounce(w http.ResponseWriter, r *http.Request) {
-	b := new(bytes.Buffer)
-	if err := passThru(b, r); err != nil {
-		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
-		report(r, err)
-		return
-	}
-	io.Copy(w, b)
-}
-
-func passThru(w io.Writer, req *http.Request) error {
-	if req.URL.Path == "/share" && !allowShare(req) {
-		return errors.New("Forbidden")
-	}
-	defer req.Body.Close()
-	url := baseURL + req.URL.Path
-	ctx, cancel := context.WithTimeout(contextFunc(req), 60*time.Second)
-	defer cancel()
-	r, err := post(ctx, url, req.Header.Get("Content-type"), req.Body)
-	if err != nil {
-		return fmt.Errorf("making POST request: %v", err)
-	}
-	defer r.Body.Close()
-	if _, err := io.Copy(w, r.Body); err != nil {
-		return fmt.Errorf("copying response Body: %v", err)
-	}
-	return nil
-}
-
-var onAppengine = false // will be overridden by appengine.go
-
-func allowShare(r *http.Request) bool {
-	if !onAppengine {
-		return true
-	}
-	switch r.Header.Get("X-AppEngine-Country") {
-	case "", "ZZ", "CN":
-		return false
-	}
-	return true
-}
diff --git a/playground/local.go b/playground/local.go
deleted file mode 100644
index 741ab6f9e7..0000000000
--- a/playground/local.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2012 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build !appengine
-
-package playground
-
-import (
-	"context"
-	"fmt"
-	"io"
-	"log"
-	"net/http"
-)
-
-func post(ctx context.Context, url, contentType string, body io.Reader) (*http.Response, error) {
-	req, err := http.NewRequest("POST", url, body)
-	if err != nil {
-		return nil, fmt.Errorf("http.NewRequest: %v", err)
-	}
-	req.Header.Set("Content-Type", contentType)
-	return http.DefaultClient.Do(req.WithContext(ctx))
-}
-
-func contextFunc(_ *http.Request) context.Context {
-	return context.Background()
-}
-
-func report(r *http.Request, err error) {
-	log.Println(err)
-}
diff --git a/playground/playground.go b/playground/playground.go
new file mode 100644
index 0000000000..14e9841831
--- /dev/null
+++ b/playground/playground.go
@@ -0,0 +1,90 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package playground registers HTTP handlers at "/compile" and "/share" that
+// proxy requests to the golang.org playground service.
+// This package may be used unaltered on App Engine Standard with Go 1.11+ runtime.
+package playground // import "golang.org/x/tools/playground"
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"golang.org/x/tools/godoc/golangorgenv"
+)
+
+const baseURL = "https://play.golang.org"
+
+func init() {
+	http.HandleFunc("/compile", bounce)
+	http.HandleFunc("/share", bounce)
+}
+
+func bounce(w http.ResponseWriter, r *http.Request) {
+	b := new(bytes.Buffer)
+	if err := passThru(b, r); os.IsPermission(err) {
+		http.Error(w, "403 Forbidden", http.StatusForbidden)
+		log.Println(err)
+		return
+	} else if err != nil {
+		http.Error(w, "500 Internal Server Error", http.StatusInternalServerError)
+		log.Println(err)
+		return
+	}
+	io.Copy(w, b)
+}
+
+func passThru(w io.Writer, req *http.Request) error {
+	if req.URL.Path == "/share" && googleCN(req) {
+		return os.ErrPermission
+	}
+	defer req.Body.Close()
+	url := baseURL + req.URL.Path
+	ctx, cancel := context.WithTimeout(req.Context(), 60*time.Second)
+	defer cancel()
+	r, err := post(ctx, url, req.Header.Get("Content-Type"), req.Body)
+	if err != nil {
+		return fmt.Errorf("making POST request: %v", err)
+	}
+	defer r.Body.Close()
+	if _, err := io.Copy(w, r.Body); err != nil {
+		return fmt.Errorf("copying response Body: %v", err)
+	}
+	return nil
+}
+
+func post(ctx context.Context, url, contentType string, body io.Reader) (*http.Response, error) {
+	req, err := http.NewRequest(http.MethodPost, url, body)
+	if err != nil {
+		return nil, fmt.Errorf("http.NewRequest: %v", err)
+	}
+	req.Header.Set("Content-Type", contentType)
+	return http.DefaultClient.Do(req.WithContext(ctx))
+}
+
+// googleCN reports whether request r is considered
+// to be served from golang.google.cn.
+func googleCN(r *http.Request) bool {
+	if r.FormValue("googlecn") != "" {
+		return true
+	}
+	if strings.HasSuffix(r.Host, ".cn") {
+		return true
+	}
+	if !golangorgenv.CheckCountry() {
+		return false
+	}
+	switch r.Header.Get("X-Appengine-Country") {
+	case "", "ZZ", "CN":
+		return true
+	}
+	return false
+}