Question 1

AsyncHttpClient vs OkHttp – which is better for high concurrency?

Accepted Answer

AsyncHttpClient excels in pure async scenarios with HTTP/2 and WebSocket support, while OkHttp offers a simpler API and better integration for mixed sync/async use. Choose AHC for max performance in async-only environments.

Question 2

How to set up HTTP/2 in AsyncHttpClient?

Accepted Answer

HTTP/2 is enabled by default for HTTPS via ALPN. No extra setup needed; the client automatically negotiates with the server and falls back to HTTP/1.1 if unsupported, but you can configure settings like ping intervals in the config.

Question 3

Can AsyncHttpClient handle resumable downloads?

Accepted Answer

Yes, it includes a built-in ResumableIOExceptionFilter for interrupted downloads, allowing you to resume from where it left off without redownloading the entire file, as detailed in the features section.

Question 4

How to use AsyncHttpClient with authentication like Kerberos?

Accepted Answer

Configure per-request realms using methods like setRealm with SPNEGO/Kerberos auth, as shown in the README, but ensure your environment supports the necessary security protocols and dependencies.

Question 5

What are the benefits of native transports in AsyncHttpClient?

Accepted Answer

Native transports like Epoll or io_uring reduce latency by using OS-specific I/O mechanisms, but they require additional dependencies and are only beneficial on supported Linux systems, as explained in the optional setup.

Question 6

How to handle errors in AsyncHttpClient async calls?

Accepted Answer

Use AsyncHandler's onThrowable method or wrap CompletableFuture with exception handling to manage errors without blocking, as demonstrated in the README examples for proper async error management.

Async Http Client

What is Async Http Client?

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