1. Let's add a new method, addResourceHandlers, to the WebConfiguration class with the following content:

@Override 
public void addResourceHandlers(ResourceHandlerRegistry registry) { 
    registry.addResourceHandler("/internal/**")
            .addResourceLocations("classpath:/"); 
}

2. Start the application by running ./gradlew clean bootRun
3. Let's open http://localhost:8080/internal/application.properties in the browser to see the following results: