spring webclient blocking call

Each read/write operation is done is a non-blocking manner, meaning that no thread sits waiting for an I/O operation to complete. You can read on and understand the bits and pieces of WebClient from scratch or download the entire demo project with all the examples from Github. For the purpose of this article, let's implement two REST endpoints, one using RestTemplate and the other using WebClient. When a request comes in, your code creates the sequence of steps and returns immediately releasing the http thread. The canonical reference for building a production grade API with Spring. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service.

Added content_length as given below. Let’s see an example of a custom ExchangeFilterFunction. RestTemplate will still be used.

The exchange() method returns a Mono that represents the response body along with other information, such as status and headers. The service layer is composed of two service interfaces – MovieClientService and MovieClientEventService. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Therefore, we need a web client tool. Spring provides a few options for building a REST client, and WebClient is recommended. For example, let's have an EmployeeService class with a getEmployeeById method to fetch data via HTTP using WebClient: As we can see, we need to provide a different mock object for each call in the chain, with four different when/thenReturn calls required. In all the examples above, we are including an Authorization header for basic authentication with the Github API. Sooner or later, the requests waiting for the results will pile up.

If you are new to reactive programming, checkout my course, Spring Framework 5: Beginner to Guru which covers reactive programming with Spring Framework 5. You need to start thinking in reactive terms if you want to gain from using WebClient. For a long time, Spring has been offering RestTemplate as a web client abstraction. If you on the other hand you have a reactive application you should never under any circumstances ever call block() or subscribe() in your application.

Additionally, since Spring 5, RestTemplate is deprecated. To subscribe to this RSS feed, copy and paste this URL into your RSS reader.


It is part of Spring WebFlux module that was introduced in Spring 5. To start using WebClient with remote Rest APIs, you need Spring WebFlux as your project dependency. NOTE: As of 5.0, the non-blocking, reactive org.springframework.web.reactive.client.WebClient offers a modern alternative to the RestTemplate with efficient support for both sync and async, as well as streaming scenarios. If you are using Spring WebFlux, you can choose to use WebClient to call external rest services. Behind the scenes, the Reactive framework will queue those “tasks” and execute them only when the appropriate response is available.

can you use webclient on a plain spring boot application, without using the webflux framework?


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