RestTemplate vs WebClient in Spring Boot

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When building APIs in Spring Boot applications, developers often need to communicate with external services.

For example:

• Calling payment APIs
• Fetching weather data
• Connecting microservices
• Communicating with third-party systems

Spring provides two major tools for this:

1. RestTemplate
2. WebClient

Understanding the difference between them is important for modern backend development.

What is RestTemplate?

RestTemplate is the traditional HTTP client provided by Spring.

It is simple, synchronous, and easy to use.

This means:

When your application sends a request, it waits until the response comes back.

Advantages of RestTemplate

• Easy to learn
• Beginner friendly
• Simple syntax
• Good for small applications

Disadvantages

• Blocking calls
• Lower scalability
• Not ideal for reactive systems
• Older approach

What is WebClient?

WebClient is the modern reactive HTTP client introduced with Spring WebFlux.

It supports asynchronous and non-blocking communication.

This makes applications faster and more scalable.

Advantages of WebClient

• Non-blocking
• Better performance
• High scalability
• Reactive programming support
• Modern approach

Disadvantages

• Slightly harder for beginners
• Reactive programming concepts required
• More complex debugging

Industry Trend

Spring officially recommends WebClient for modern applications.

RestTemplate is still usable but is considered a legacy approach.

Most new enterprise applications prefer WebClient.