.. _version_history_1.2.0:

1.2.0 (March 7, 2017)
======================



Changes
-------


* **cds**: :ref:`Cluster discovery service (CDS) API <v1.5:config_cluster_manager_cds>`.
* **config**: Envoy configuration is now checked against a JSON schema.
* **envoy**: Numerous small changes and fixes not listed here.
* **http2**: No longer maintain closed HTTP/2 streams for priority calculations. Leads to substantial memory
  savings for large meshes.
* **lightstep**: LightStep tracer :ref:`parent/child span association <v1.5:arch_overview_tracing>`.
* **listener**: ``use_original_dst`` and ``bind_to_port`` :ref:`listener options <v1.5:config_listeners>` (useful for
  iptables based transparent proxy support).
* **logging**: HTTP access log runtime filter.
* **matching**: Regex header matching during HTTP routing.
* **outlier_detection**: :ref:`Outlier detection <v1.5:arch_overview_outlier_detection>` (passive health checking).
* **rate_limiting**: Vastly :ref:`enhanced global rate limit configuration <v1.5:arch_overview_rate_limit>` via the HTTP
  rate limiting filter.
* **routing**: :ref:`Ring hash <v1.5:arch_overview_load_balancing_types>` consistent load balancer, as well as HTTP
  consistent hash routing based on a policy.
* **routing**: :ref:`Route discovery service (RDS) API <v1.5:config_http_conn_man_rds>`.
* **routing**: Auto host rewrite during HTTP routing.
* **routing**: HTTP router :ref:`x-envoy-upstream-rq-timeout-alt-response header
  <v1.5:config_http_filters_router_x-envoy-upstream-rq-timeout-alt-response>` support.
* **routing**: HTTP routing to a cluster retrieved from a header.
* **routing**: TCP proxy filter :ref:`route table support <v1.5:config_network_filters_tcp_proxy>`.
* **routing**: Weighted cluster HTTP routing.
* **ssl**: Various :ref:`third party library upgrades <v1.5:install_requirements>`, including using BoringSSL as
  the default SSL provider.
* **stats**: Configurable stats flush interval.