1.15.0 (July 7, 2020)¶

Incompatible Behavior Changes¶

Changes that are expected to cause an incompatibility if applicable; deployment changes are likely required

build: official released binary is now built on Ubuntu 18.04, requires glibc >= 2.27.
client_ssl_auth: the auth_ip_white_list stat has been renamed to auth_ip_allowlist.
header to metadata: on_header_missing rules with empty values are now rejected (they were skipped before).
router: path_redirect now keeps query string by default. This behavior may be reverted by setting runtime feature envoy.reloadable_features.preserve_query_string_in_path_redirects to false.
tls: fixed a bug where wilcard matching for “*.foo.com” also matched domains of the form “a.b.foo.com”. This behavior can be temporarily reverted by setting runtime feature envoy.reloadable_features.fix_wildcard_matching to false.

Minor Behavior Changes¶

Changes that may cause incompatibilities for some users, but should not for most

access loggers: applied existing buffer limits to access logs, as well as stats for logged / dropped logs. This can be reverted temporarily by setting runtime feature envoy.reloadable_features.disallow_unbounded_access_logs to false.
build: runs as non-root inside Docker containers. Existing behaviour can be restored by setting the environment variable ENVOY_UID to 0. ENVOY_UID and ENVOY_GID can be used to set the envoy user’s uid and gid respectively.
health check: in the health check filter the percentage of healthy servers in upstream clusters is now interpreted as an integer.
hot restart: added the option --use-dynamic-base-id to select an unused base ID at startup and the option --base-id-path to write the base id to a file (for reuse with later hot restarts).
http: changed early error path for HTTP/1.1 so that responses consistently flow through the http connection manager, and the http filter chains. This behavior may be temporarily reverted by setting runtime feature envoy.reloadable_features.early_errors_via_hcm to false.
http: fixed several bugs with applying correct connection close behavior across the http connection manager, health checker, and connection pool. This behavior may be temporarily reverted by setting runtime feature envoy.reloadable_features.fix_connection_close to false.
http: fixed a bug where the upgrade header was not cleared on responses to non-upgrade requests. Can be reverted temporarily by setting runtime feature envoy.reloadable_features.fix_upgrade_response to false.
http: stopped overwriting date response headers. Responses without a date header will still have the header properly set. This behavior can be temporarily reverted by setting envoy.reloadable_features.preserve_upstream_date to false.
http: stopped adding a synthetic path to CONNECT requests, meaning unconfigured CONNECT requests will now return 404 instead of 403. This behavior can be temporarily reverted by setting envoy.reloadable_features.stop_faking_paths to false.
http: stopped allowing upstream 1xx or 204 responses with Transfer-Encoding or non-zero Content-Length headers. Content-Length of 0 is allowed, but stripped. This behavior can be temporarily reverted by setting envoy.reloadable_features.strict_1xx_and_204_response_headers to false.
http: upstream connections will now automatically set ALPN when this value is not explicitly set elsewhere (e.g. on the upstream TLS config). This behavior may be temporarily reverted by setting runtime feature envoy.reloadable_features.http_default_alpn to false.
listener: fixed a bug where when a static listener fails to be added to a worker, the listener was not removed from the active listener list.
router: extended to allow retries of streaming or incomplete requests. This removes stat rq_retry_skipped_request_not_complete.
router: extended to allow retries by default when upstream responds with x-envoy-overloaded.

Bug Fixes¶

Changes expected to improve the state of the world and are unlikely to have negative effects

adaptive concurrency: fixed a minRTT calculation bug where requests started before the concurrency limit was pinned to the minimum would skew the new minRTT value if the replies arrived after the start of the new minRTT window.
buffer: fixed CVE-2020-12603 by avoiding fragmentation, and tracking of HTTP/2 data and control frames in the output buffer.
grpc-json: fixed a bug when in trailers only gRPC response (e.g. error) HTTP status code is not being re-written.
http: fixed a bug in the grpc_http1_reverse_bridge filter where header-only requests were forwarded with a non-zero content length.
http: fixed a bug where in some cases slash was moved from path to query string when merging of adjacent slashes is enabled.
http: fixed CVE-2020-12604 by changing stream_idle_timeout to also defend against an HTTP/2 peer that does not open stream window once an entire response has been buffered to be sent to a downstream client.
http: fixed CVE-2020-12605 by including request URL in request header size computation, and rejecting partial headers that exceed configured limits.
http: fixed several bugs with applying correct connection close behavior across the http connection manager, health checker, and connection pool. This behavior may be temporarily reverted by setting runtime feature envoy.reloadable_features.fix_connection_close to false.
listener: fixed CVE-2020-8663 by adding runtime support for per-listener limits on active/accepted connections.
overload management: fixed CVE-2020-8663 by adding runtime support for global limits on active/accepted connections.
prometheus stats: fixed the sort order of output lines to comply with the standard.
udp: the reuse_port listener option must now be specified for UDP listeners if concurrency is > 1. This previously crashed so is considered a bug fix.
upstream: fixed a bug where Envoy would panic when receiving a GRPC SERVICE_UNKNOWN status on the health check.

Removed Config or Runtime¶

Normally occurs at the end of the deprecation period

http: removed legacy connection pool code and their runtime features: envoy.reloadable_features.new_http1_connection_pool_behavior and envoy.reloadable_features.new_http2_connection_pool_behavior.

New Features¶

access loggers: added file access logger config log_format.
access loggers: added GRPC_STATUS operator on logging format.
access loggers: added gRPC access logger config added API version to explicitly set the version of gRPC service endpoint and message to be used.
access loggers: extended specifier for FilterStateFormatter to output unstructured log string.
admin: added support for dumping EDS config at /config_dump?include_eds.
aggregate cluster: made route retry_priority predicates work with this cluster type.
build: official released binary is now built on Ubuntu 18.04, requires glibc >= 2.27.
build: official released binary is now built with Clang 10.0.0.
cluster: added an extension point for configurable upstreams.
compressor: exposed generic compressor filter to users.
config: added identifier stat that reflects control plane identifier.
config: added version_text stat that reflects xDS version.
decompressor: exposed generic decompressor filter to users.
dynamic forward proxy: added SNI based dynamic forward proxy support.
dynamic forward proxy: added configurable circuit breakers for resolver on DNS cache. This behavior can be temporarily disabled by the runtime feature envoy.reloadable_features.enable_dns_cache_circuit_breakers. If this runtime feature is disabled, the upstream circuit breakers for the cluster will be used even if the DNS Cache circuit breakers are configured.
dynamic forward proxy: added allow_insecure_cluster_options to allow disabling of auto_san_validation and auto_sni.
ext_authz filter: added v2 deny_at_disable, v3 deny_at_disable. This allows force denying protected paths while filter gets disabled, by setting this key to true.
ext_authz filter: added API version field for both HTTP and Network filters to explicitly set the version of gRPC service endpoint and message to be used.
ext_authz filter: added v3 allowed_upstream_headers_to_append to allow appending multiple header entries (returned by the authorization server) with the same key to the original request headers.
fault: added support for controlling the percentage of requests that abort, delay and response rate limits faults are applied to using HTTP headers to the HTTP fault filter.
fault: added support for specifying grpc_status code in abort faults using HTTP header or abort fault configuration in HTTP fault filter.
filter: added upstream_rq_time stats to the GPRC stats filter. Disabled by default and can be enabled via enable_upstream_stats.
grpc: added support for Google gRPC custom channel arguments.
grpc-json: added support for streaming response using google.api.HttpBody.
grpc-json: send a x-envoy-original-method header to grpc services.
gzip filter: added option to set zlib’s next output buffer size.
hds: updated to allow to explicitly set the API version of gRPC service endpoint and message to be used.
header to metadata: added support for regex substitutions on header values.
health checks: allowed configuring health check transport sockets by specifying transport socket match criteria.
http: added local_reply config to http_connection_manager to customize local reply.
http: added stripping port from host header support.
http: added support for proxying CONNECT requests, terminating CONNECT requests, and converting raw TCP streams into HTTP/2 CONNECT requests. See upgrade documentation for details.
listener: added in place filter chain update flow for tcp listener update which doesn’t close connections if the corresponding network filter chain is equivalent during the listener update. Can be disabled by setting runtime feature envoy.reloadable_features.listener_in_place_filterchain_update to false. Also added additional draining filter chain stat for listener manager to track the number of draining filter chains and the number of in place update attempts.
logger: added –log-format-prefix-with-location command line option to prefix ‘%v’ with file path and line number.
lrs: added new envoy_api_field_service.load_stats.v2.LoadStatsResponse.send_all_clusters field in LRS response, which allows management servers to avoid explicitly listing all clusters it is interested in; behavior is allowed based on new “envoy.lrs.supports_send_all_clusters” capability in client_features field.
lrs: updated to allow to explicitly set the API version of gRPC service endpoint and message to be used.
lua: added per route config for Lua filter.
lua: added tracing to the httpCall() API.
metrics service: added API version to explicitly set the version of gRPC service endpoint and message to be used.
network filters: added a postgres proxy filter.
network filters: added a rocketmq proxy filter.
performance: enabled stats symbol table implementation by default. To disable it, add –use-fake-symbol-table 1 to the command-line arguments when starting Envoy.
ratelimit: added support for use of dynamic metadata dynamic_metadata as a ratelimit action.
ratelimit: added API version to explicitly set the version of gRPC service endpoint and message to be used.
ratelimit: support specifying dynamic overrides in rate limit descriptors using limit override config.
redis: added acl support downstream_auth_username for downstream client ACL authentication, and auth_username to configure authentication usernames for upstream Redis 6+ server clusters with ACL enabled.
regex: added support for enforcing max program size via runtime and stats to monitor program size for Google RE2.
request_id: added to always_set_request_id_in_response setting to set x-request-id header in response even if tracing is not forced.
router: added more fine grained internal redirect configs to the internal_redirect_policy field.
router: added regex substitution support for header based hashing.
router: added support for RESPONSE_FLAGS and RESPONSE_CODE_DETAILS header formatters.
router: allow Rate Limiting Service to be called in case of missing request header for a descriptor if the skip_if_absent field is set to true.
runtime: added new gauge deprecated_feature_seen_since_process_start that gets reset across hot restarts.
server: added the option --drain-strategy to enable different drain strategies for DrainManager::drainClose().
server: added server.envoy_bug_failures statistic to count ENVOY_BUG failures.
stats: added the option to report counters as deltas to the metrics service stats sink.
tracing: made tracing configuration fully dynamic and every HTTP connection manager can now have a separate tracing provider.
udp: upgraded udp_proxy filter to v3 and promoted it out of alpha.

Deprecated¶

Tracing provider configuration as part of bootstrap config has been deprecated in favor of configuration as part of HTTP connection manager.
The HTTP Gzip filter has been deprecated in favor of Compressor.
The * GoogleRE2.max_program_size field is now deprecated. Management servers are expected to validate regexp program sizes instead of expecting the client to do it. Alternatively, the max program size can be enforced by Envoy via runtime.
The internal_redirect_action field and max_internal_redirects field are now deprecated. This changes the implemented default cross scheme redirect behavior. All cross scheme redirects are disallowed by default. To restore the previous behavior, set allow_cross_scheme_redirect=true and use safe_cross_scheme, in predicates.
File access logger fields format, json_format and typed_json_format are deprecated in favor of log_format.
A warning is now logged when v2 xDS api is used. This behavior can be temporarily disabled by setting envoy.reloadable_features.enable_deprecated_v2_api_warning to false.
Using cluster circuit breakers for DNS Cache is now deprecated in favor of DNS cache circuit breakers. This behavior can be temporarily disabled by setting envoy.reloadable_features.enable_dns_cache_circuit_breakers to false.