Spring Http Client Demo

This repo contains two projects:

• test-api - simple Spring Boot servlet based app to act as a "Downstream API"
• test-client - Spring Boot servlet based app with multiple Http Client configurations to consume 'test-api'

The below diagram depicts the setup (Running Prometheus is optional)

Setup

1. Clone this repo
2. Start test-api in one terminal window

   cd test api
   ./gradlew bootRun
   

3. Start test-client in another terminal window

   cd test-client
   ./gradlew bootRun
   

4. (Optional) Start Prometheus, see below for more info
5. Run a test, samples below (the later 2 require autocannon)
   • Single Request: curl localhost:8081/rc/test/0
   • Parallel Requests: ./parallel.sh 2 - send two parallel requests
   • Load test: ./load-test.sh

Prometheus setup

1. Download Prometheus for your OS.
2. Update prometheus.yml - adding a snippet in the scrape_configs to scrape from the Prometheus Actuator in the config file:

   scrape_configs:
   - job_name: 'spring boot scrape'
       metrics_path: '/actuator/prometheus'
       scrape_interval: 5s
       static_configs:
       - targets: ['localhost:8081']

3. Start prometheus
4. Load Console: http://localhost:9090/targets - make sure you see 'spring boot scrape'
5. Check out the Prometheus page for some queries