![]() ![]() RestTemplate and WebClient are both libraries for making HTTP requests in Java. An important note is that WebClient also supports synchronous operations, similar to RestTemplate, through the block() method. When a request is made using WebClient, the thread that initiates the request continues its life without being blocked, thus providing an asynchronous structure. Similar to Spring WebFlux, it enables reactive programming, and is based on an event-driven structure. Unlike RestTemplate, WebClient is asynchronous and non-blocking. If there are many requests in the application, it will use many threads and connections accordingly, which will result in cost and load on the server and could cause performance issues if the numbers increase. Once a request is sent, RestTemplate waits for the response until it reaches a previously defined timeout. Webclient vs RestTemplateįor each request, RestTemplate creates a new thread and uses it until a response is received. WebClient emerges as the strongest alternative. It provides modern and innovative methods and supports reactive programming.įrom our definitions, we can quickly see that there are significant differences between the two, and it would be beneficial to explore alternatives, especially after hearing that RestTemplate will be put into maintenance mode. WebClient is developed as an alternative to RestTemplate and supports synchronous, asynchronous and non-blocking operations, as well as streaming features. According to a note in the latest documentation of Spring, RestTemplate is being put into maintenance mode and it is indicated that no new features will be added. You may have heard that RestTemplate is reaching the end of its life. Why should you prefer Webclient instead of RestTemplate? Flux: It is used for Publishers that can contain 0 to N events.Mono: It is used for Publishers that can contain 0 or 1 events.You can access the project with examples for WebClient on Github in this series. When we consider HTTP requests that are made to other services (or used in our tests), it is important to ensure that they are supported by a reactive HTTP client infrastructure. This means the application needs to be fully reactive, along with all its components. For an application to be reactive, end-to-end operations must be compatible with reactive components. In my previous article, I explained that we can design reactive applications with Spring Webflux. WebClient, which comes with Spring WebFlux, provides a synchronous/asynchronous HTTP client structure that enables us to execute all our requests. In addition to reactive operations, it also supports synchronous and blocking requests. WebClient is a reactive HTTP client that supports non-blocking and asynchronous operations for making HTTP requests. ![]()
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