smithy-lang/smithy-kotlin v1.7.3

on GitHub

[1.7.3] - 07/27/2026

Features

• (aws-signing-default) Cache SigV4 signing key derivation to avoid redundant HMAC computations when credentials, region, service, and date are unchanged
• (http-client-engine-okhttp) Expose maxIdleConnections on OkHttpEngineConfig and change the default from 5 to maxConcurrency to align with the SDK's default, reducing connection churn and TLS re-establishment overhead under concurrent workloads

Fixes

• #1656 (runtime-core) Use kotlin.uuid.Uuid for UUID generation instead of kotlin.random.Random which is unsafe with Lambda SnapStart due to deterministic PRNG state being captured in snapshots

Miscellaneous

• (http-client-engine-crt) Reduce CPU and memory overhead of the CRT HTTP engine's response body handling by writing received bytes directly into a window-sized channel, eliminating the intermediate unbounded channel and per-response writer coroutine