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- XML statistics can now be replaced with a Lua implementation instead. See proxy.config.stats.enable_lua below.
- We have added a multi origin hierarchy to parent selection which lets you treat parent proxies as if there were origin servers, or origin servers as if they were parent proxies. See the "parent_is_proxy" option in parent.config.
- Parent selection now also supports a failure modefailover retries, where you can retry requests against a different parent in some (configurable) casescase the parent is unavailable or does not have the desired content. See the "parent_retry" option in parent.config.
- There are some better instrumentation for memory debugging, including running with Address Sanitizer, and OpenSSL.
Jira: TS-4207, TS-4115, TS-4287, TS-4197, TS-4212, TS-4297, TS-3863
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_connectionsis 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.
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- proxy.config.http.transaction_active_timeout_in is now also overridable.
Jira: TS-4341, TS-3922, TS-4064, TS-4099, TS-3535, TS-4087, TS-4162,
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We continue to improve our TLS (HTTPS) features and support. Noteworthy in 6.2.x is:
- H2 HTTP/2 is now much more feature rich, with a slew of bug fixes, configuration options, and performance optimizations. Try it out!
- In particular, we now also have priority support for H2, but it's maybe not production ready for all use cases.
- SPDY has been marked as deprecated, and will be removed for v7.0.0.
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