launchdarkly-server-sdk

3.2.0 (2026-08-10)

Features

• Add FDv2 wire format and protocol handler (#177) (a94f88c)
• Add optional float-roundtrip feature (#184) (465b231)

This PR was generated with Release Please. See documentation.

Features

• Add FDv2 wire format and protocol handler (#177) (a94f88c)
• Add optional float-roundtrip feature (#184) (465b231)

3.1.2 (2026-07-21)

Bug Fixes

• Bump MSRV from 1.94 to 1.95 (#179) (103afe1)
• Redact private attributes in migration op events (#181) (d2e51bc)

This PR was generated with Release Please. See documentation.

Bug Fixes

• Bump MSRV from 1.94 to 1.95 (#179) (103afe1)
• Redact private attributes in migration op events (#181) (d2e51bc)

3.1.1 (2026-06-08)

Bug Fixes

• Bump MSRV from 1.93 to 1.94 (#173) (1d2ce03)

This PR was generated with Release Please. See documentation.

Bug Fixes

• Bump MSRV from 1.93 to 1.94 (#173) (1d2ce03)

3.1.0 (2026-05-29)

Features

• add X-LaunchDarkly-Instance-Id header (SDK-2359) (#170) (370cb10)

This PR was generated with Release Please. See documentation.

Features

• add X-LaunchDarkly-Instance-Id header (SDK-2359) (#170) (370cb10)

3.0.3 (2026-05-11)

Bug Fixes

• keep StreamingDataSource alive on non-Eof stream errors (#168) (b91a9ca)

This PR was generated with Release Please. See documentation.

Bug Fixes

• keep StreamingDataSource alive on non-Eof stream errors (#168) (b91a9ca)

3.0.2 (2026-04-20)

Bug Fixes

• Bump MSRV from 1.92 to 1.93 (#164) (f432bbf)

This PR was generated with Release Please. See documentation.

Bug Fixes

• Bump MSRV from 1.92 to 1.93 (#164) (f432bbf)

3.0.1 (2026-03-06)

Bug Fixes

• Bump MSRV from 1.91 to 1.92 (#160) (a83abad)

This PR was generated with Release Please. See documentation.

Bug Fixes

• Bump MSRV from 1.91 to 1.92 (#160) (a83abad)

3.0.0 (2026-03-04)

⚠ BREAKING CHANGES

• Remove deprecated initialized_async function
• Allow filtering all_flags_state to mobile only
• Add native-tls feature
• Enable event compression by default
• Replace local hyper dependency with new launchdarkly-sdk-transport

Features

• Add native-tls feature (0ea0703)
• Add support for test datasource (0ea0703)
• Allow filtering all_flags_state to mobile only (0ea0703)
• Choose crypto library with crypto-(aws-lc-rs|openssl) features (0ea0703)
• Enable event compression by default (0ea0703)
• Remove deprecated initialized_async function (0ea0703)
• Replace local hyper dependency with new launchdarkly-sdk-transport (0ea0703)
• Support synchronous event sending with new flush_blocking method (0ea0703)

This PR was generated with Release Please. See documentation.

⚠ BREAKING CHANGES

• Remove deprecated initialized_async function
• Allow filtering all_flags_state to mobile only
• Add native-tls feature
• Enable event compression by default
• Replace local hyper dependency with new launchdarkly-sdk-transport

Features

• Add native-tls feature (0ea0703)
• Add support for test datasource (0ea0703)
• Allow filtering all_flags_state to mobile only (0ea0703)
• Choose crypto library with crypto-(aws-lc-rs|openssl) features (0ea0703)
• Enable event compression by default (0ea0703)
• Remove deprecated initialized_async function (0ea0703)
• Replace local hyper dependency with new launchdarkly-sdk-transport (0ea0703)
• Support synchronous event sending with new flush_blocking method (0ea0703)

2.6.3 (2026-01-26)

Bug Fixes

• Bump LRU minimum from 0.13.0 to 0.16.3 (bff3dff)
• Bump MSRV from 1.83 to 1.85 (bff3dff)
• Bump MSRV from 1.85 to 1.88 (#145) (45552c9)
• Bump MSRV from 1.88 to 1.91 (#147) (e497ad8)

Bug Fixes

• Bump LRU minimum from 0.13.0 to 0.16.3 (bff3dff)
• Bump MSRV from 1.83 to 1.85 (bff3dff)
• Bump MSRV from 1.85 to 1.88 (#145) (45552c9)
• Bump MSRV from 1.88 to 1.91 (#147) (e497ad8)

2.6.2 (2025-12-18)

Bug Fixes

• Bump eventsource client from v0.14.0 -> v0.16.0 (90ddf72)
• Bump MSRV from 1.82 to 1.83 (90ddf72)
• Update aws-lc-rs from v1.13.3 to 1.14.1 (#128) (1295da6)

Bug Fixes

• Bump eventsource client from v0.14.0 -> v0.16.0 (90ddf72)
• Bump MSRV from 1.82 to 1.83 (90ddf72)
• Update aws-lc-rs from v1.13.3 to 1.14.1 (#128) (1295da6)

Bug Fixes

• Replace ring usage with aws lc rs for FIPS compliance (#124) (843355e)

Features

• Inline context for custom and migration op events (#120) (7a5da5c)

Bug Fixes

• Bump MSRV to 1.82.0 (#121) (e55c176)

Bug Fixes

• Bump eventsource-client 0.13 -> 0.14 (ae56d7c)
• Bump lru 0.12 -> 0.13 (ae56d7c)
• Bump rand 0.8 -> 0.9 (ae56d7c)
• Bump thiserror 1.0 -> 2.0 (ae56d7c)

Features

• Add support for daemon mode (#110) (1a16e39)

Bug Fixes

• Bump MSRV to 1.81 (#109) (1b472ff)

Bug Fixes

• Enable event-compression during docs.rs generation (#104) (c50a65d)

Features

• Add option to enable compression of event payloads (#102) (5cc7aac)

Features

• support prerequisite relation data in all_flags_detail (#99) (d0ad003)

Bug Fixes

• Allow event retries even if initial request fails to connect (#93) (a9c0150)
• Suppress error log on es::Error::Eof (#96) (20d0891)

Features

• Add option to omit anonymous users from index and identify events (#89) (78c9668)
• Add support for migrations (#90) (445ab74)
• Add wait_for_initialization with timeout parameter (#76) (45e3451)

Bug Fixes

• Bump rustc to 1.74 (#78) (0c1c58d)

Features

• Inline contexts for all evaluation events (#63) (b31b5e7)
• Redact anonymous attributes within feature events (#64) (66e2e54)

Bug Fixes

• Bump MSRV to 1.70.0 (#61) (3a4d8e7)
• deps: Bump hyper to fix CVE-2022-31394 (#59) (fdd2c32)
• deps: Bump tokio to fix CVE-2021-45710 (#60) (64d6e7b)

Bug Fixes

• Export config::BuildError as ConfigBuildError (#57) (28e8d78)

⚠ BREAKING CHANGES

• Make rustls dependency optional (#136)
• Update to latest event source client (#135)

Features

• Make rustls dependency optional (#136) (fac8df7)
• Update to latest event source client (#135) (91f7297)

Fixed:

• Fixed an issue with evaluating user targets as part of a multi-kind context.

Removed:

• Removed reliance on built crate.

Fixed:

• The secure mode hashing algorithm has been updated to use the context's fully qualified key.

Changed:

• Updated MSRV from 1.60.0 to 1.64.0

Fixed:

• Ensure an error is logged if a persistence store fails to initialize appropriately.
• Resolve issue with parsing partially read polling response bodies.

The latest version of this SDK supports LaunchDarkly's new custom contexts feature. Contexts are an evolution of a previously-existing concept, "users." Contexts let you create targeting rules for feature flags based on a variety of different information, including attributes pertaining to users, organizations, devices, and more. You can even combine contexts to create "multi-contexts."

For detailed information about this version, please refer to the list below. For information on how to upgrade from the previous version, please read the migration guide.

Added:

• Added: hyper @ 0.14.17
• Added: hyper-rustls @ 0.23.1
• Added: types Context, ContextBuilder, MultiContextBuilder, Reference, Kind

Changed:

• All SDK methods that accepted users now accept contexts.
• The MSRV is now 1.60.0
• Updated: lru from 0.7.2 to 0.8.1
• Updated: launchdarkly-server-sdk-evaluation from 1.0.0-beta.5 to 1.0.0
• Updated: moka from 0.7.1 to 0.9.6
• Updated: uuid from 1.0.0-alpha.1 to 1.2.2

Fixed:

• Fixed handling of unexpected HTTP status codes.

Removed:

• Removed alias method
• Removed types User, UserBuilder. See Context, ContextBuilder, and MultiContextBuilder instead.
• Removed reqwest dependency
• Removed threadpool dependency

Added:

• Enforce ApplicationInfo length restrictions.
• Set missing HTTP headers for event payloads.

Fixed:

• Correct handling of specific temporary network failures.
• Prevent shutdown broadcast error when in polling mode.
• Reset event summaries correctly.

Added

• Add support for persistent data stores, which allow flag and segment information to be stored in external databases like redis.
• Introduced ApplicationInfo, for configuration of application metadata that may be used in LaunchDarkly analytics or other product features. This does not affect feature flag evaluations.
• Support private attribute configuration for redacting user properties from analytic events.

Changed

• Pin evaluation crate version to specific beta release.
• Bump versions in multiple dependencies.
• Update to using Rust 2021 edition.
• Update deserialization to handle invalid variation indexes.
• Remove reliance on spectral test crate.
• Allow re-using a connector object between clients to reduce initialization overhead.

Fixed

• Fixed missing README in published crate.
• Enable HTTPS support for reqwest

Added

• Initial support for contract test harness.
• Ensure we can build using musl build tools.

Changed

• Drop OpenSSL dependency in favor of rustls.

Fixed

• Creation date is now included in alias events.
• Emit index events for feature events correctly.

Initial beta release of the LaunchDarkly Server-Side SDK for Rust.