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Discover how to handle timeouts in `Spring WebFlux WebClient` with Kotlin effectively by returning a default value instead of an exception.
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Handling Spring WebFlux WebClient Timeout in Kotlin: A Step-by-Step Guide

Handling timeouts in asynchronous applications can often lead to unexpected behavior, particularly if an application isn’t equipped to deal with such scenarios gracefully. If you're using Spring WebFlux WebClient in Kotlin and facing issues with exceptions thrown during HTTP request timeouts, fear not! In this article, we will explore how to handle these timeouts properly and return a default value instead of letting the application crash.

Understanding the Problem

You're making a GET HTTP call using Spring WebFlux WebClient, but when the request exceeds the specified timeout, it throws an exception. This kind of behavior can lead to disruptions in your application’s workflow, particularly if the request is expected to return data on a regular basis.

In your situation, you might want to return a default response (like an empty map in your response model) instead of having the application fail. This approach allows your application to maintain a smoother user experience and prevents unnecessary crashes.

The Solution

Here’s how you can gracefully handle timeout exceptions in your WebClient calls:

Step 1: Update Your WebClient Configuration

First, ensure that you have correctly configured your WebClient with suitable connect and read timeouts. The following example outlines how to achieve this:

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Step 2: Create your Default Response Model

Define a response model that will be returned in case of a timeout. In your case, it is a simple data class representing a conversation:

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Step 3: Wrap Your Call with Exception Handling

Next, wrap your HTTP request in a try/catch block to catch exceptions thrown during the request, as shown below:

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Here, the tryAwaitBodyOrElseLogged extension function will attempt to get the body of the response, but if it encounters an exception (like a timeout), it logs the error and returns the default conversation.

Step 4: Implement the tryAwaitBodyOrElseLogged Extension Function

Here's the extension function you need to implement for handling the exceptions in a clean way:

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This function attempts to await the response body, and upon any failure, it logs the warning before returning the specified default value.

Conclusion

By wrapping your WebClient calls inside a try/catch block and using a logging strategy, you can seamlessly handle timeout exceptions and return a default response. This solution helps maintain application reliability even in instances of network issues or delays, contributing to a better overall user experience.

Now you are equipped to handle WebClient timeout scenarios in Kotlin effectively. Happy coding!