From 2.2 to 2.3

New isFilterInsecureCipherSuites config to disable unsecure and weak ciphers filtering performed internally in Netty.

From 2.1 to 2.2

New Typesafe config extra module
new enableWebSocketCompression config to enable per-message and per-frame WebSocket compression extension

AHC 2.1 targets Netty 4.1.
org.asynchttpclient.HttpResponseHeaders was dropped in favor of io.netty.handler.codec.http.HttpHeaders.
org.asynchttpclient.cookie.Cookie was dropped in favor of io.netty.handler.codec.http.cookie.Cookie as AHC's cookie parsers were contributed to Netty.
AHC now has a RFC6265 CookieStore that is enabled by default. Implementation can be changed in AsyncHttpClientConfig.
AsyncHttpClient now exposes stats with getClientStats.
AsyncHandlerExtensions was dropped in favor of default methods in AsyncHandler.
WebSocket and WebSocketListener methods were renamed to mention frames
AsyncHttpClientConfig various changes:
- new getCookieStore now lets you configure a CookieStore (enabled by default)
- new isAggregateWebSocketFrameFragments now lets you disable WebSocket fragmented frames aggregation
- new isUseLaxCookieEncoder lets you loosen cookie chars validation
- isAcceptAnyCertificate was dropped, as it didn't do what its name stated
- new isUseInsecureTrustManager lets you use a permissive TrustManager, that would typically let you accept self-signed certificates
- new isDisableHttpsEndpointIdentificationAlgorithm disables setting HTTPS algorithm on the SSLEngines, typically disables SNI and HTTPS hostname verification
- new isAggregateWebSocketFrameFragments lets you disable fragmented WebSocket frames aggregation