What’s New in ATS v10.1

Metrics

Added proxy.process.http.total_parent_marked_down_timeout
Added proxy.process.http.total_client_connections_uds
Added proxy.process.ssl.group.user_agent.P-256
Added proxy.process.ssl.group.user_agent.P-384
Added proxy.process.ssl.group.user_agent.P-521
Added proxy.process.ssl.group.user_agent.X25519
Added proxy.process.ssl.group.user_agent.P-224
Added proxy.process.ssl.group.user_agent.X448
Added proxy.process.ssl.group.user_agent.X25519MLKEM768

Plugins

stats_over_http: Add prometheus metrics format option
header_rewrite: Add set-plugin-cntl operator
header_rewrite: Add LAST-CAPTURE condition to access the last capture group of a regex
header_rewrite: Add support for state variables that can be used in conditions and operators.
header_rewrite: Add support for an else clause in conditions
header_rewrite: Add a GROUP condition
header_rewrite: Add a HTTP-CNTL condition to control if expensive rules are run.
header_rewrite: Add the set-body-from operator to set the response body from a URL
header_rewrite: The set-body-from operator now defers renabling the transaction until after the fetch of the URL providing the response body
slice: Support unix domain socket paths
slice: Add configuration to limit slicing of some objects.
access_control: Generate a session cookie when exp=0 appears in a TokenRespHdr origin response header.
compress: Add range request control options to adjust behavior based on the Accept-Encoding or Range headers
lua: Add support for millisecond sleep
escalate: Now handles dispatching to the failover server if the original server is down
ja3_fingerprint: Add the --preserve option to avoid modifing some existing ja* fields.
ja4_fingerprint: Added this new plugin
rate_limit: Add a --rate option to limit by RPS

TS API

Add TSVConnPPInfoGet to get Proxy Protocol information.
Add TSContScheduleOnEntirePool and TSContScheduleEveryOnEntirePool to schedule continuations on every thread in a pool.

Features

Add the cqssg log field for TLS group name logging
traffic_ctl: Add a new server command to show some basic internal information
traffic_ctl: Now displays YAML format output when the --records option is set.
traffic_ctl: Added the server debug command to enable/disable diagnostics and debug tags at runtime with a single command.
cripts: Add some new high level convenience APIs
cripts: Add optional reason parameter to Error::Status
sni.yaml: Add server_cipher_suite and server_TLSv1_3_cipher_suites to allow overriding the setting from records.yaml
Add support for getting authority information from Proxy Protocol V2. with new ppa log formatter.
Add support for getting UDP address info from Proxy Protocol.
Added support for listening on a Unix Domain Socket. See proxy.config.http.server_ports
Added option for proxy.config.http.auth_server_session_private to only mark the connection private if Proxy-Authorization or Www-Authenticate headers are present
It is now an ERROR if a remap ACL has more than one @action parameter. This was an error in ATS 10.0.x
Add a fragment-size option in volume.config to control the fragment size of the volume.
Add an optional avg_obj_size to volume.config to control the directory entry sizing.
The proxy.config.http.cache.post_method is now an overridable config.
Defer deleting the copied plugin shared object file to startup to make it easier to debug crashes in plugins.

Configuration

Added proxy.config.http.negative_revalidating_list to configure the list of status codes that apply to the negative revalidating feature
Added proxy.config.ssl.session_cache.mode to control TLS session caching. This is intended to replace the legacy proxy.config.ssl.session_cache.enabled and proxy.config.ssl.session_cache.value configurations. The proxy.config.ssl.session_cache.enabled setting was documented but never implemented, while proxy.config.ssl.session_cache.value was implemented but not documented. The new proxy.config.ssl.session_cache.mode functions just like the legacy proxy.config.ssl.session_cache.value did in the ealier 10.0 release. The proxy.config.ssl.session_cache.mode setting provides a clear and consistent interface going forward. For backward compatibility, .enabled is now implemented, but both .enabled and .value will be removed in ATS 11.x.

What’s New in ATS v10.0

This version of Apache Traffic Server™ includes over <x> commits, from <y> pull requests. A total of <z> contributors have participated in this development cycle.

New Features

JSON-RPC based interface for administrative API

Traffic Server now exposes a JSON-RPC node to interact with external tools. Check JSONRPC for more details.
traffic_ctl has a new command monitor to show a continuously updating list of metrics
ip_allow.yaml and remap.config now support named IP ranges via IP Categories. See the ip_categories key definition in ip_allow.yaml for information about their use and definitions.
sni.yaml fqdn:tunnel_route, beside the already supported match group number, configuration now also supports the destination port using a variable specification either for the incoming connection port or the port that was specified by the incoming Proxy Protocol payload. Check sni.yaml for more information.
The records.yaml entry proxy.config.system_clock was added to control the underlying system clock that ATS uses for internal timing
OCSP requests is now be able to use GET method. See proxy.config.ssl.ocsp.request_mode for more information.
TSHttpSsnInfoIntGet has been added.

New or modified Configurations

ip_allow.yaml and remap.config ACL actions

There are two new sets of actions for HTTP request method filtering introduced in Traffic Server 10.x:

Both ip_allow.yaml and remap.config now support the set_allow and set_deny actions. These actions both behave like allow and deny did for ip_allow.yaml pre Traffic Server 10.x.
In addition, remap.config now supports add_allow and add_deny actions. These behave like allow and deny actions did for remap.config ACLs pre Traffic Server 10.x.

The details about the motivation and behavior of these actions are documented in ACL Filters.

Logging and Metrics

The numbers of HTTP/2 frames received have been added as metrics.

Plugins

authproxy - --forward-header-prefix parameter has been added
prefetch - Cmcd-Request header support has been added
xdebug - --enable option to selectively enable features has been added
system_stats - Stats about memory have been added
slice plugin - This plugin was promoted to stable.

JSON-RPC

Remote clients, like traffic_ctl have now bi-directional access to the plugin space. For more details check Handler implementation.

Replaced autotools build system with cmake

See Installing Traffic Server for more information

Switch to C++20

Plugins are now required to be compiled as C++ code, rather than straight C. The API is tested with C++20, so code compatible with this version is preferred. TSDebug and related functions are removed. Debug tracing should now be done using cpp:func:Dbg and related functions, as in Traffic Server core code.

C++ Plugin API Deprecated

It is deprecated in this release. It will be deleted in ATS 11.

Symbols With INKUDP Prefix

In the plugin API, all types and functions starting with the prefix INKUDP are removed.

New plugin hook for request sink transformation

A new hook, TS_HTTP_REQUEST_CLIENT_HOOK, has been added. This provides the analoguas functionality of TS_HTTP_RESPONSE_CLIENT_HOOK, for request bodies.

HTTP/2

Support for HTTP/2 on origin server connections has been added. This is disabled by default. For more details check proxy.config.ssl.client.alpn_protocols
Support for CONNECT method has been added.
Window size control has been improved. For more details check proxy.config.http2.flow_control.policy_in

HTTP UI Removed

The stats and cache inspector pages were unmaintained and removed in this release.