How to enable browser caching in spring boot?

@jasen 

To enable browser caching in a Spring Boot application, you can leverage Spring Boot's caching mechanisms along with setting appropriate headers in the response. Here is how you can do it:

1. Enable caching in your Spring Boot application by annotating your service methods with @Cacheable and enabling caching in your application configuration class:

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@SpringBootApplication
@EnableCaching
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

1. Use the @Cacheable annotation on methods that you want to cache the results for. For example:

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@Service
public class MyService {

    @Cacheable("myCache")
    public String getSomeData() {
        // Method implementation
    }
}

With this configuration, Spring Boot will cache the result of the getSomeData method in the myCache cache.

1. Set appropriate cache control headers in the response to instruct the browser to cache static resources. You can do this by adding a Filter to set the cache control headers:

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@Component
public class CacheControlFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        response.setHeader("Cache-Control", "max-age=3600"); // Set cache expiration time to 1 hour
        filterChain.doFilter(request, response);
    }
}

1. Ensure that your static resources (e.g., CSS, JavaScript files) are properly served with cache control headers to leverage browser caching.

With these steps, you can enable browser caching in your Spring Boot application to improve performance by caching static resources on the client side.