These are the highlights of new features or additions to existing features in v5.0.x and 5.1.x. For the complete list of all changes see this JIRA Release Notes.

General Changes

Some changes have been made to the HostDB data structures. The defaults configurations that ships with ATS v6.x still works, but if you have made changes to either of these configurations, you might have to modify them. Specifically, you might have to either reduce the number of entries supported, or, increase the storage size.

CONFIG proxy.config.hostdb.size INT 120000
CONFIG proxy.config.hostdb.storage_size INT 45375488

Jira: TS-4207

New configuration options

• proxy.config.http.origin_max_connections_queue limits the number of requests to be queued when the proxy.config.http.origin_max_connections is reached.
• Two new timeouts are available for WebSockets: proxy.config.websocket.no_activity_timeout and proxy.config.websocket.active_timeout.
• The congestion control algorithm used is now configurable for both incoming, and outbound connections, via proxy.config.net.tcp_congestion_control_in and proxy.config.net.tcp_congestion_control_out.
• In preparation for the new Lua metrics module in v7.0.0, you can enable this feature in v6.2.x with proxy.config.stats.enable_lua.
• An experimental implementation of H2 streams priorities can be enabled with proxy.config.http2.stream_priority_enabled.
• We now provide better control over various H2 (HTTP/2) features, including proxy.config.http2.min_concurrent_streams_in, proxy.config.http2.max_active_streams_in and proxy.config.http2.active_timeout_in.

Jira: TS-4341, TS-3922, TS-4064, TS-4099

TLS

 We continue to improve our TLS (HTTPS) features and support. Noteworthy in 6.2.x is:

Jira: 

Plugin Improvements

The following plugins have new features and improvements.

header_rewrite

• We now support variable expansion in the set-redirect operator.
• You can now do matching operators on the port.
• We do not need Boost.

Jira: TS-2955, TS-3108, TS-3068

background_fetch

• The plugin behavior and activation can now be controlled per remap-rule.
• You an control the behavior based on content type.

Jira: TS-2682, TS-2683

Plugin APIs

The following additions were made to the plugin APIs:

• TSMutexDestroy() was added, for symmetry with the TSMutexCreate() API.
• TSTextLogObjectRollingSizeMbSet() was added, it as simply missing.
• TSHttpHdrHostGet() was added.

Jira: TS-1432, TS-3059, TS-3101