Replit performance

Async Request Timeout on Replit

Asynchronous requests timeout before completing, even though operation should finish quickly. Async operations hang indefinitely.

Misconfigured timeout values or blocking operations in async code cause hangs.

Error Messages You Might See

java.util.concurrent.TimeoutException AsyncRequestTimeoutException Connection timeout
java.util.concurrent.TimeoutExceptionAsyncRequestTimeoutExceptionConnection timeout

Common Causes

  1. Timeout value too short for actual operation time
  2. Blocking operation on async thread
  3. Deadlock in async task handling
  4. Thread pool exhausted, tasks queued indefinitely
  5. Missing error handling for timeout exception

How to Fix It

Set appropriate timeouts based on operation nature (5-30s). Use non-blocking async libraries (WebClient, Mono, Flux). Configure thread pool appropriately. Implement proper exception handling for TimeoutException. Use CompletableFuture.orTimeout() or Flux.timeout() for time limits. Monitor thread pool metrics.

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Frequently Asked Questions

What timeout should async requests have?

5-10s for local operations, 10-30s for external APIs

How do I use WebClient with timeout?

WebClient.create() with HttpClient.create().responseTimeout(Duration.ofSeconds(10))

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