WebClient / RestTemplate

Synchronous vs Non-Blocking HTTP Clients

`RestTemplate` is in maintenance mode. Spring recommends `WebClient` (from `spring-boot-starter-webflux`) for high-throughput non-blocking HTTP requests.

Production Code Example:

package com.anujsingh.digitalguru.client;

import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.stereotype.Component;

@Component
public class WebClientDemo {
    private final WebClient webClient = WebClient.create("https://api.example.com");

    public String fetchData() {
        return webClient.get().uri("/data").retrieve().bodyToMono(String.class).block();
    }
}

Key Architectural Concepts & Best Practices:

When working with WebClient / RestTemplate in enterprise Spring Boot applications, keep these key architectural guidelines in mind:

• Separation of Concerns: Maintain a strict boundary between HTTP endpoints, service logic, and database persistence layers.
• Framework Conventions: Rely on Spring Boot auto-configuration defaults whenever possible, overriding settings only via application.yml or @Configuration classes when customized behavior is required.
• Production Monitoring & Reliability: Ensure proper exception handling, thread-safety, and resource cleanup to prevent memory leaks and unexpected runtime downtime.
• Developer Ergonomics: Write clean, self-documenting code with modern Java features (Records, Lambdas, Streams) to simplify code reviews and maintenance.

Summary Takeaway:

Mastering WebClient / RestTemplate ensures that your Java & Spring Boot backend microservices remain maintainable, secure, and compliant with modern enterprise software engineering standards.