AsyncHttpClient/async-http-client

Health v2 · maintenance only

Adoption not part of the score

6393 stars · 1600 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

AsyncHttpClient (AHC) is a high-performance asynchronous, non-blocking HTTP and WebSocket client library for Java built on Netty. It supports HTTP/1.1, HTTP/2 with multiplexing, WebSockets, authentication schemes, proxies, and native transports like Epoll and io_uring.

Use cases

• make non-blocking HTTP requests from Java
• consume WebSockets in a JVM application
• call HTTP/2 APIs with connection multiplexing
• download large files with resumable downloads
• send requests through HTTP or SOCKS proxies
• upload multipart files asynchronously

When to choose

• you need high-throughput async HTTP in Java with a mature Netty foundation
• you need WebSocket, HTTP/2, or advanced auth (NTLM, Kerberos) support
• you want native transport performance on Linux

When to avoid

• you want a simple blocking HTTP client with minimal dependencies
• you are not on the JVM or need Java 8 support
• you prefer the JDK built-in HttpClient for basic use cases

Facets

library · maturity active

http-client websocket concurrency web-development developer-tools networking jvm windows netty async http2 non-blocking java linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="AsyncHttpClient/async-http-client")