Adds an Endpoints sample with multiple versions.

endpoints/multiple-versions/README.md

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+# Google Cloud Endpoints & Java with Multiple Versions
+This sample demonstrates how to use Google Cloud Endpoints using a Java backend
+that supports multiple versions.
+
+For more information, see the Google Cloud Endpoints documentation on
+[Running multiple API versions](https://cloud.google.com/endpoints/docs/multiple-api-versions).
+
+## Calling your API
+
+Please refer to the Google Cloud Endpoints
+[documentation](https://cloud.google.com/endpoints/docs/app-engine/) for App
+Engine Flexible Environment to learn about creating an API Key and calling your
+API.
+
+## Viewing the Endpoints graphs
+
+By using Endpoints, you get access to several metrics that are displayed
+graphically in the Cloud Console.
+
+To view the Endpoints graphs:
+
+1. Go to the [Endpoints section in Cloud Console](https://console.cloud.google.com/endpoints)
+   of the project you deployed your API to.
+2. Click on your API to view more detailed information about the metrics
+   collected.

endpoints/multiple-versions/container-engine.yaml

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+# Copyright 2015 Google Inc.
+#
+# 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.
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: esp-echo
+spec:
+  ports:
+  - port: 80
+    targetPort: 8081
+    protocol: TCP
+    name: http
+  selector:
+    app: esp-echo
+  type: LoadBalancer
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: esp-echo
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: esp-echo
+    spec:
+      containers:
+      # [START esp]
+      - name: esp
+        image: gcr.io/endpoints-release/endpoints-runtime:1
+        args: [
+          "-p", "8081",
+          "-a", "127.0.0.1:8080",
+          "-s", "SERVICE_NAME",
+          "-v", "SERVICE_CONFIG_ID",
+        ]
+      # [END esp]
+        ports:
+          - containerPort: 8081
+      - name: echo
+        image: gcr.io/google-samples/echo-java:1.0
+        ports:
+          - containerPort: 8080

endpoints/multiple-versions/openapi-v2.yaml

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+# Copyright 2015 Google Inc.
+#
+# 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.
+
+# [START swagger]
+swagger: "2.0"
+info:
+  description: "A simple Google Cloud Endpoints API example."
+  title: "Endpoints Example"
+  version: "2.0.0"
+host: "echo-api.endpoints.YOUR-PROJECT-ID.cloud.goog"
+# [END swagger]
+basePath: "/v2"
+consumes:
+  - "application/json"
+produces:
+  - "application/json"
+schemes:
+  - "https"
+paths:
+  "/echo":
+    post:
+      description: "Echo back a given message."
+      operationId: "echo"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Echo"
+          schema:
+            $ref: "#/definitions/echoMessage"
+      parameters:
+        - 
+          description: "Message to echo"
+          in: body
+          name: message
+          required: true
+          schema:
+            $ref: "#/definitions/echoMessage"
+  "/auth/info/googlejwt":
+    get:
+      description: "Returns the requests' authentication information."
+      operationId: "auth_info_google_jwt"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Authenication info."
+          schema:
+            $ref: "#/definitions/authInfoResponse"
+      x-security:
+        - 
+          google_jwt:
+            audiences:
+              # This must match the "aud" field in the JWT. You can add multiple
+              # audiences to accept JWTs from multiple clients.
+              - "echo.endpoints.sample.google.com"
+  "/auth/info/googleidtoken":
+    get:
+      description: "Returns the requests' authentication information."
+      operationId: "authInfoGoogleIdToken"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Authenication info."
+          schema:
+            $ref: "#/definitions/authInfoResponse"
+      x-security:
+        - 
+          google_id_token:
+            audiences:
+              # Your OAuth2 client's Client ID must be added here. You can add
+              # multiple client IDs to accept tokens from multiple clients.
+              - "YOUR-CLIENT-ID"
+definitions:
+  echoMessage:
+    properties:
+      msg:
+        type: "string"
+  authInfoResponse:
+    properties:
+      id:
+        type: "string"
+      email:
+        type: "string"
+# This section requires all requests to any path to require an API key.
+security:
+  - api_key: []
+securityDefinitions:
+  # This section configures basic authentication with an API key.
+  api_key:
+    type: "apiKey"
+    name: "key"
+    in: "query"
+  # This section configures authentication using Google API Service Accounts
+  # to sign a json web token. This is mostly used for server-to-server
+  # communication.
+  google_jwt:
+    authorizationUrl: ""
+    flow: "implicit"
+    type: "oauth2"
+    # This must match the 'iss' field in the JWT.
+    x-google-issuer: "jwt-client.endpoints.sample.google.com"
+    # Update this with your service account's email address.
+    x-google-jwks_uri: "https://www.googleapis.com/service_accounts/v1/jwk/YOUR-SERVICE-ACCOUNT-EMAIL"
+  # This section configures authentication using Google OAuth2 ID Tokens.
+  # ID Tokens can be obtained using OAuth2 clients, and can be used to access
+  # your API on behalf of a particular user.
+  google_id_token:
+    authorizationUrl: ""
+    flow: "implicit"
+    type: "oauth2"
+    x-google-issuer: "accounts.google.com"
+    x-google-jwks_uri: "https://www.googleapis.com/oauth2/v1/certs"

endpoints/multiple-versions/openapi.yaml

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+# Copyright 2015 Google Inc.
+#
+# 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.
+
+# [START swagger]
+swagger: "2.0"
+info:
+  description: "A simple Google Cloud Endpoints API example."
+  title: "Endpoints Example"
+  version: "1.0.0"
+host: "echo-api.endpoints.YOUR-PROJECT-ID.cloud.goog"
+# [END swagger]
+basePath: "/v1"
+consumes:
+  - "application/json"
+produces:
+  - "application/json"
+schemes:
+  - "https"
+paths:
+  "/echo":
+    post:
+      description: "Echo back a given message."
+      operationId: "echo"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Echo"
+          schema:
+            $ref: "#/definitions/echoMessage"
+      parameters:
+        - 
+          description: "Message to echo"
+          in: body
+          name: message
+          required: true
+          schema:
+            $ref: "#/definitions/echoMessage"
+  "/auth/info/googlejwt":
+    get:
+      description: "Returns the requests' authentication information."
+      operationId: "auth_info_google_jwt"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Authenication info."
+          schema:
+            $ref: "#/definitions/authInfoResponse"
+      x-security:
+        -
+          google_jwt:
+            audiences:
+              # This must match the "aud" field in the JWT. You can add multiple
+              # audiences to accept JWTs from multiple clients.
+              - "echo.endpoints.sample.google.com"
+  "/auth/info/googleidtoken":
+    get:
+      description: "Returns the requests' authentication information."
+      operationId: "authInfoGoogleIdToken"
+      produces:
+        - "application/json"
+      responses:
+        200:
+          description: "Authenication info."
+          schema:
+            $ref: "#/definitions/authInfoResponse"
+      x-security:
+        - 
+          google_id_token:
+            audiences:
+              # Your OAuth2 client's Client ID must be added here. You can add
+              # multiple client IDs to accept tokens from multiple clients.
+              - "YOUR-CLIENT-ID"
+definitions:
+  echoMessage:
+    properties:
+      message:
+        type: "string"
+  authInfoResponse:
+    properties:
+      id:
+        type: "string"
+      email:
+        type: "string"
+# This section requires all requests to any path to require an API key.
+security:
+  - api_key: []
+securityDefinitions:
+  # This section configures basic authentication with an API key.
+  api_key:
+    type: "apiKey"
+    name: "key"
+    in: "query"
+  # This section configures authentication using Google API Service Accounts
+  # to sign a json web token. This is mostly used for server-to-server
+  # communication.
+  google_jwt:
+    authorizationUrl: ""
+    flow: "implicit"
+    type: "oauth2"
+    # This must match the 'iss' field in the JWT.
+    x-google-issuer: "jwt-client.endpoints.sample.google.com"
+    # Update this with your service account's email address.
+    x-google-jwks_uri: "https://www.googleapis.com/service_accounts/v1/jwk/YOUR-SERVICE-ACCOUNT-EMAIL"
+  # This section configures authentication using Google OAuth2 ID Tokens.
+  # ID Tokens can be obtained using OAuth2 clients, and can be used to access
+  # your API on behalf of a particular user.
+  google_id_token:
+    authorizationUrl: ""
+    flow: "implicit"
+    type: "oauth2"
+    x-google-issuer: "accounts.google.com"
+    x-google-jwks_uri: "https://www.googleapis.com/oauth2/v1/certs"