The Apache HttpComponents project is pleased to announce 5.4-alpha2
release of HttpComponents HttpClient.

This is the second and likely the last ALPHA release in the 5.3 release
series. It finalizes the new Cache API introduced in the previous ALPHA
release and also improves TLS customization for the classic transport,
SNI and endpoint identification support, authentication data caching,
and HTTP context performance. It also introduces support for optional
TLS upgrades for HTTP/1.1 connections.


IMPORTANT! Please note the new cache entry serialization format is
incompatible with earlier versions of HttpClient Cache. Persistent
caches (file system based, Memcached, EhCAche with object
serialization) created with any earlier version MUST be flushed and re-
populated or the cache backend MUST be configured to use the old
deprecated cache entry serializer.


Notable changes and features included in the 5.4 series:

* Improved conformance to RFC 9110 (HTTP Semantics), RFC 7616 (HTTP
Digest Access Authentication), RFC 2617 (’Basic’ HTTP Authentication
Scheme).

* UTF-8 encoding to be used by default for text where appropriate.

* Compatibility with Java Virtual Threads and Java 21 Runtime.

* Redesign and rewrite of the HTTP caching protocol layer for better
efficiency and improved conformance to RFC 9111 (HTTP Caching).

* Cache control and context APIs.

* ETag APIs.

* TLS SNI and endpoint identification improvements.

* Support for RFC 2817 (Upgrading to TLS Within HTTP/1.1).

* Auth cache no longer makes use of Java serialization.

* Deprecation of ConnectionSocketFactory and
LayeredConnectionSocketFactory.

* HttpContext optimization and performance improvement.

  
Download - <http://hc.apache.org/downloads.cgi>
Release notes -
<https://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-5.4.x.txt
HttpComponents site - <http://hc.apache.org/>
  

About HttpComponents HttpClient

The Hyper-Text Transfer Protocol (HTTP) is perhaps the most significant
protocol used on the Internet today. Web services, network-enabled
appliances and the growth of network computing continue to expand the
role of the HTTP protocol beyond user-driven web browsers, while
increasing the number of applications that require HTTP support.

Designed for extension while providing robust support for the base HTTP
protocol, HttpClient may be of interest to anyone building HTTP-aware
client applications such as web browsers, web service clients, or
systems that leverage or extend the HTTP protocol for distributed
communication.


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