addressed review comments

runtime/test/src/test/java/com/google/apphosting/runtime/jetty9/SendErrorTest.java

@@ -83,22 +83,22 @@ public void testSendError() throws Exception {
     String url = runtime.jettyUrl("/send-error");
     ContentResponse response = httpClient.GET(url);
     assertEquals(HttpStatus.OK_200, response.getStatus());
-    assertThat(response.getContentAsString(), containsString("<h1>Hello, world!</h1>"));
+    assertThat(response.getContentAsString(), containsString("<h1>Hello, welcome to App Engine Java Standard!</h1>"));
 
     url = runtime.jettyUrl("/send-error?errorCode=404");
     response = httpClient.GET(url);
     assertEquals(HttpStatus.NOT_FOUND_404, response.getStatus());
-    assertThat(response.getContentAsString(), containsString("<h1>Error 404 Not Found</h1>"));
+    assertThat(response.getContentAsString(), containsString("<h1>404 - Page Not Found (App Engine Java Standard)</h1>"));
 
     url = runtime.jettyUrl("/send-error?errorCode=500");
     response = httpClient.GET(url);
     assertEquals(HttpStatus.INTERNAL_SERVER_ERROR_500, response.getStatus());
-    assertThat(response.getContentAsString(), containsString("<h1>Error 500 Internal Server Error</h1>"));
+    assertThat(response.getContentAsString(), containsString("<h1>500 - Internal Server Error (App Engine Java Standard)</h1>"));
 
     url = runtime.jettyUrl("/send-error?errorCode=503");
     response = httpClient.GET(url);
     assertEquals(HttpStatus.SERVICE_UNAVAILABLE_503, response.getStatus());
-    assertThat(response.getContentAsString(), containsString("<h1>Unhandled Error</h1>"));
+    assertThat(response.getContentAsString(), containsString("<h1>Unhandled Error - Service Temporarily Unavailable (App Engine Java Standard)</h1>"));
 
   }
 

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee10/404.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 404 Not Found</h1>
+<h1>404 - Page Not Found (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee10/500.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 500 Internal Server Error</h1>
+<h1>500 - Internal Server Error (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee10/hello.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Hello, world!</h1>
+<h1>Hello, welcome to App Engine Java Standard!</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee10/unhandled-error.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Unhandled Error</h1>
+<h1>Unhandled Error - Service Temporarily Unavailable (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee8/404.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 404 Not Found</h1>
+<h1>404 - Page Not Found (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee8/500.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 500 Internal Server Error</h1>
+<h1>500 - Internal Server Error (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee8/hello.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Hello, world!</h1>
+<h1>Hello, welcome to App Engine Java Standard!</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/ee8/unhandled-error.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Unhandled Error</h1>
+<h1>Unhandled Error - Service Temporarily Unavailable (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/jetty94/404.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 404 Not Found</h1>
+<h1>404 - Page Not Found (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/jetty94/500.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Error 500 Internal Server Error</h1>
+<h1>500 - Internal Server Error (App Engine Java Standard)</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/jetty94/WEB-INF/appengine-web.xml

@@ -20,6 +20,7 @@
   <application>senderror</application>
   <version>1</version>
   <system-properties>
-    <property name="appengine.use.EE8" value="true"/>
+    <property name="appengine.use.EE8" value="false"/>
+    <property name="appengine.use.EE10" value="false"/>
   </system-properties>
 </appengine-web-app>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/jetty94/hello.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Hello, world!</h1>
+<h1>Hello, welcome to App Engine Java Standard!</h1>

runtime/testapps/src/main/resources/com/google/apphosting/runtime/jetty9/senderrorapp/jetty94/unhandled-error.html

@@ -13,4 +13,4 @@
  See the License for the specific language governing permissions and
  limitations under the License.
 -->
-<h1>Unhandled Error</h1>
+<h1>Unhandled Error - Service Temporarily Unavailable (App Engine Java Standard)</h1>