# AsyncHttpClient/async-http-client

Asynchronous, non-blocking HTTP & WebSocket client for the JVM

Repository: https://github.com/AsyncHttpClient/async-http-client
Canonical: https://ross.abutalabs.com/products/async-http-client
Language: Java
License: Apache-2.0
License Family: permissive
Topics: netty, async, java, asynchttpclient, ahc, http-client
Last push: 2026-08-26T20:09:35+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 96, longevity 100
- inputs: {"age_days": 5658, "days_push": 7, "days_rel": 24, "gap_med": 25, "n_releases_24m": 18}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6393, forks 1600 (observed 2026-08-28T04:09:43.043036+00:00)

## What it is
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
- artifact type: library
- maturity: active
- function: http-client, websocket, concurrency
- domain: web-development, developer-tools, networking
- platform: jvm, windows
- tags: netty, async, http2, non-blocking, java, linux, macos

## Member repositories
- AsyncHttpClient/async-http-client (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:43.043036+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:45:02.639225+00:00, confidence not recorded.
  - readme: https://github.com/AsyncHttpClient/async-http-client (fetched 2026-08-28T04:09:43.043036+00:00, sha 99d87229f11b)
- Data as of 2026-08-30T08:39:29.467469+00:00.