Don't use UrlFetchTransport in App Engine Flex environment

google-cloud-core/src/main/java/com/google/cloud/HttpTransportOptions.java

@@ -50,8 +50,9 @@ public static class DefaultHttpTransportFactory implements HttpTransportFactory
 
     @Override
     public HttpTransport create() {
-      // Consider App Engine
-      if (ServiceOptions.getAppEngineAppId() != null) {
+      // Consider App Engine Standard
+      if (System.getProperty("com.google.appengine.runtime.version") != null
+          && System.getenv("GAE_SERVICE") == null) {
         try {
           return new UrlFetchTransport();
         } catch (Exception ignore) {

testing/google-cloud-appengine-java8/pom.xml

@@ -41,7 +41,7 @@
 
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
-        <version>3.3</version>
+        <version>3.5.1</version>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
           <source>${java.source.version}</source>

testing/google-cloud-appengine-java8/src/main/webapp/WEB-INF/appengine-web.xml

@@ -9,4 +9,5 @@
   <manual-scaling>
     <instances>1</instances>
   </manual-scaling>
+  <url-stream-handler>native</url-stream-handler>
 </appengine-web-app>

testing/google-cloud-managed-test/src/main/java/com/google/cloud/managed/test/GcjFlexTestServlet.java → testing/google-cloud-managed-test/src/main/java/com/google/cloud/managed/test/GaeGcjTestServlet.java

@@ -29,7 +29,7 @@
 import javax.servlet.http.HttpServletResponse;
 
 @WebServlet(name = "flex", value = "/test")
-public class GcjFlexTestServlet extends HttpServlet {
+public class GaeGcjTestServlet extends HttpServlet {
 
   private static final long serialVersionUID = 523885428311420041L;
 

testing/google-cloud-managed-test/src/main/java/com/google/cloud/managed/test/GaeInfoServlet.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.cloud.managed.test;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.Map;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet(name = "hex", value = "/info")
+public class GaeInfoServlet extends HttpServlet {
+
+  private static final long serialVersionUID = -3598229312089602597L;
+
+  @Override
+  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+      throws ServletException, IOException {
+    resp.setContentType("text");
+
+    PrintWriter out = resp.getWriter();
+    out.append("\nENVIRONMENT VARIABLES:\n\n");
+
+    Map<String, String> envVars = System.getenv();
+    for (Map.Entry<String, String> entry : envVars.entrySet()) {
+      out.append(entry.getKey()).append("=").append(entry.getValue()).append('\n');
+    }
+
+    out.append("\n\nSYSTEM PROPERTIES:\n\n");
+    System.getProperties().list(out);
+
+    out.close();
+  }
+}