The REST API Level 0 mission shows how to map business operations to a remote procedure call endpoint over HTTP using a REST framework. This corresponds to Level 0 in the Richardson Maturity Model. Creating an HTTP endpoint using REST and its underlying principles to define your API lets you quickly prototype and design the API flexibly.

This booster introduces the mechanics of interacting with a remote (exposed by <strong>Apache Camel</strong>) service using the HTTP protocol. It allows you to:

• Execute an HTTP GET request on camel/greetings/{name}` endpoint; using the url parameter {name} and producing a response in JSON format with a payload of Hello, $name! with $name replaced by the value of the url parameter used into the request.

• Browse the api’s Swagger page.

This booster can run in the following modes:

• Standalone on your machine

• Single-node OpenShift cluster

• OpenShift Online at https://developers.redhat.com/launch

The most effective way to demonstrate the booster is to deploy and run the project on OpenShift. For more details about running this booster on a single-node OpenShift cluster, CI/CD deployments, as well as the rest of the runtime, see the Spring Boot Runtime Guide.

You can run this booster as a standalone project on your local machine:

1. Download the project and extract the archive on your local filesystem.

2. Build the project:

   $ cd PROJECT_DIR
   $ mvn clean package

3. then run the services as follows:

   $ mvn spring-boot:run

4. Visit http://localhost:8080 and follow the instructions on that page.

If you have a single-node OpenShift cluster, such as Minishift or the Red Hat Container Development Kit, installed and running, you can deploy your booster there. A single-node OpenShift cluster provides you with access to a cloud environment that is similar to a production environment.

To deploy your booster to a running single-node OpenShift cluster:

1. Download the project and extract the archive on your local filesystem.

2. Log in to your OpenShift cluster:

   $ oc login -u developer -p developer

3. Create a new OpenShift project for the booster:

   $ oc new-project MY_PROJECT_NAME

4. Build and deploy the project to the OpenShift cluster:

   $ mvn clean -DskipTests fabric8:deploy -Popenshift

5. In your browser, navigate to the MY_PROJECT_NAME project in the OpenShift console. Wait until you can see that the pod for the fuse-rest-http-booster application has started up.

6. Just above the entry for the fuse-rest-http-booster application on the Overview page, there is a URL of the form http://fuse-rest-http-booster-MY_PROJECT_NAME.OPENSHIFT_IP_ADDR.nip.io. Click on the URL to access the greetings service application and follow the instructions on that page.

You can deploy the circuit breaker booster directly to OpenShift Online when you create the project at https://developers.redhat.com/launch.

1. Visit https://developers.redhat.com/launch.

2. At the Deployment step, select Use OpenShift Online.

3. Follow the on-screen instructions to create a new REST API Level 0 project using the Fuse runtime.