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.
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General changes
- We do no longer require the Boost library to build!
Jira: TS-3068,
New configuration options
- You can now force unsatisfiable Range: requests to go to origin even when read-while-writer is in effect. This can help avoid significant latency on large objects. The setting is overloaded on the existing proxy.config.cache.enable_read_while_writer configuration.
- The option to specify configuration location, proxy.config.config_dir, is now actually implemented.
- Add option to support SO_LINGER to origin server, via proxy.config.net.sock_option_flag_out.
Jira: TS-2314, TS-3192, TS-3119
TLS
We continue to improve our TLS (HTTPS) features and support. Noteworthy in 5.2.x is:
- SSLv3 is now disabled by default!
- Dynamic TLS record size tuning. According to Ilya, this makes us the first server that is all Green.
- Add forward secrecy support with DHE.
- Add ssl_pre_handshake hook for better plugin access to SSL handling.
- Improved session cache, for better performance and scalability.
- New configuration for OpenSSL session cache, proxy.config.ssl.session_cache.auto_clear.
Jira: TS-3153, TS-2503, TS-2417, TS-2956, TS-3080, TS-3127
traffic_line
- traffic_line -m is now using an unachored regular expression, similar to how diagnostic tracers work.
- traffic_line --backtrace will produce a stack backtrace for all running threads.
traffic_layout
A new command line utility, traffic_layout, is now available. This will show the layout and configuration option for the ATS build tree.
Jira: TS-3041
traffic_via
This is a new command line tool, to parse and decipher the Via: header that Traffic Server can produce. This is useful for debugging e.g. cache results etc.
Jira: TS-3149
traffic_crashlog
This is the helper application around the new crash logging feature. For more information, see the documentation.
Jira: TS-3195
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
stats_over_http
This plugin will now emit JSON numbers.
Jira: TS-3071
background_fetch
- The plugin behavior and activation can now be controlled per remap-rule.
- You an control the behavior based on content type.
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