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REST Clients

This section describes options for client-side access to REST endpoints.

RestTemplate

RestTemplate is a synchronous client to perform HTTP requests. It is the original Spring REST client and exposes a simple, template-method API over underlying HTTP client libraries.

Note
 As of 5.0 the RestTemplate is in maintenance mode, with only minor requests for changes and bugs to be accepted going forward. Please, consider using the WebClient which offers a more modern API and supports sync, async, and streaming scenarios.

See REST Endpoints for details.

WebClient

WebClient is a non-blocking, reactive client to perform HTTP requests. It was introduced in 5.0 and offers a modern alternative to the RestTemplate, with efficient support for both synchronous and asynchronous, as well as streaming scenarios.

In contrast to RestTemplate, WebClient supports the following:

  • Non-blocking I/O.

  • Reactive Streams back pressure.

  • High concurrency with fewer hardware resources.

  • Functional-style, fluent API that takes advantage of Java 8 lambdas.

  • Synchronous and asynchronous interactions.

  • Streaming up to or streaming down from a server.

See WebClient for more details.