Configuration clients are regular Spring Boot applications. All you need to do is provide the server configuration URI to read the centralized configuration, as follows:

spring:
  application:
    name: configuration-demo
  cloud:
    config:
      uri: http://localhost:9000

The following code snippet shows a REST endpoint reading a centralized configuration and serving the read value as its own response:

@RestController
@RefreshScope
public class ConfigurationDemoController {

    @Value("${configuration.dynamicValue}")
    private String dynamicValue;

    @GetMapping(path = "/dynamic-value")
    public ResponseEntity<String> readDynamicValue() {
        return new ResponseEntity<>(this.dynamicValue, HttpStatus.OK);
    }
}

The following screenshot shows the configuration file stored in the Git repository:

Once you execute a request against the preceding endpoint, it will produce the following output:

$ curl http://localhost:8080/dynamic-value 
Old Dynamic Value

Change the value of the configuration variable in the file stored in Git, as shown in the following screenshot:

If you hit the endpoint, you will retrieve the same output as before. In order to reload the configuration, you will need to reload the configuration variables by hitting the /refresh endpoint by using a POST request, as shown in the following code:

$ curl -X POST http://localhost:8080/actuator/refresh
["config.client.version","configuration.dynamicValue"]

After reloading the configuration, the endpoint will serve a response using the new provided value, as you can see in the following output:

$ curl http://localhost:8080/dynamic-value
New Dynamic Value