spring webclient async example
We also looked at the benefits it provides by going through configuring the client, preparing the request, and processing the response. • This example needs only the Spring Web dependency. In addition, it contains methods to check the response status, header and body. • First we need to specify an HTTP method of a request by invoking method(HttpMethod method) or calling its shortcut methods such as get, post, and delete: The next step is to provide a URL. If Yes, then I welcome you to this article about WebClient, the new reactive HTTP client introduced in Spring 5. Assuming we've got a Controller class and we injected it into a needed class, we can write: After building a WebTestClient object, all following operations in the chain are going to be similar to the WebClient until the exchange method (one way to get a response), which provides the WebTestClient.ResponseSpec interface to work with useful methods like the expectStatus, expectBody, and expectHeader: In this article, we explored the WebClient, a new enhanced Spring mechanism for making requests on the client-side. Spring Developers, Did you ever felt the need for an asynchronous/non-blocking HTTP client with a fluent functional style API that was easy to use and efficient? In this article, we’ll consume Github’s APIs using WebClient. You can also tune the Executor to increase the corePoolSize attribute for instance. It makes it easy to pipeline multiple asynchronous operations and merge them into a single asynchronous computation. There are many more things you can tune. @ComponentScan: Tells Spring to look for other components, configurations, and services in the com/example package, letting it find the controllers. For example, if we want to set a request body, there are two available ways: filling it with a BodyInserter or delegating this work to a Publisher: The BodyInserter is an interface responsible for populating a ReactiveHttpOutputMessage body with a given output message and a context used during the insertion.
The filter function will intercept every WebClient request and add this header. The findUser method is flagged with Spring’s @Async annotation, indicating that it should run on a separate thread. 1. It requires your github username and a personal access token that you can generate from https://github.com/settings/tokens. The parameters will automatically be replaced by WebClient before making the request -, You can also gain full programmatic control over the request URI using a UriBuilder like so -, If you have the request body in the form of a Mono or a Flux, then you can directly pass it to the body() method in WebClient, otherwise you can just create a Mono/Flux from an object and pass it like so -, If you have an actual value instead of a Publisher (Flux/Mono), you can use the syncBody() shortcut method to pass the request body -, Finally, you can use various factory methods provided by BodyInserters class to construct a BodyInserter object and pass it in the body() method. Did you notice that there was not a single line of XML? Add Dependency in an existing Spring Boot project, If you have an existing Spring Boot project, you can add the spring-webflux module by adding the following dependency in the pom.xml file -. We're also going to look at the WebTestClient, a WebClient designed to be used in tests. In our case, we want to limit the number of concurrent threads to two and limit the size of the queue to 500.
You need to check the status codes yourself and handle them in the way you want to. Alternatively, you can build the JAR file by using ./gradlew build and then run the JAR file, as follows: If you use Maven, you can run the application by using ./mvnw spring-boot:run.
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