July 23rd, 2025

Internal changes only with this release

July 21st, 2025

New this release:

• 🎉 (client, smithy-rs#4203) Add support for configuring auth schemes manually using an auth scheme preference list.
  The preference list allows customers to reprioritize the order of auth schemes originally
  determined by the auth scheme resolver.
  Customers can configure the auth scheme preference at the following locations, listed in order of precedence:
  1. Service Client Configuration

  use aws_runtime::auth::sigv4;
  use aws_smithy_runtime_api::client::auth::AuthSchemeId;
  use aws_smithy_runtime_api::client::auth::http::HTTP_BEARER_AUTH_SCHEME_ID;
  
  let config = aws_sdk_s3::Config::builder()
      .auth_scheme_preference([AuthSchemeId::from("scheme1"), sigv4::SCHEME_ID, HTTP_BEARER_AUTH_SCHEME_ID])
      // ...
      .build();

  2. Environment Variable

  AWS_AUTH_SCHEME_PREFERENCE=scheme1, sigv4, httpBearerAuth
  

  3. Configuration File

  auth_scheme_preference=scheme1, sigv4, httpBearerAuth
  

  With this configuration, the auth scheme resolver will prefer to select them in the specified order,
  if they are supported.

July 17th, 2025

New this release:

• (all, smithy-rs#4212) Event streams now allocate a right-sized buffer avoiding repeated reallocations during serialization

July 16th, 2025

New this release:

• (client) re-use checksums on retry attempts for enhanced durability

July 8th, 2025

Breaking Changes:

• ⚠ (all, smithy-rs#4191) Update MSRV to Rust 1.86.0

New this release:

• (client, smithy-rs#4076, smithy-rs#4198) Allows customers to configure the auth schemes and auth scheme resolver. For more information see the GitHub discussion.

June 30th, 2025

Internal changes only with this release

June 27th, 2025

New this release:

• 🐛 (client) Fix hyper 1.x connection refused errors not marked as retryable
• (client, smithy-rs#4186) Make Rpc V2 CBOR a compatible protocol for awsQuery using awsQueryCompatible trait

June 11th, 2025

Breaking Changes:

• ⚠️ (all, smithy-rs#4154) Update MSRV to 1.85.0
• 🐛⚠️ (server) Fixed SmithyRpcV2CBOR Router to properly respect case in service names, preventing routing failures for services with mixed-case service shape ID.

New this release:

• 🐛 (client, smithy-rs#4165) Fix default supported protocols incorrectly ordered in ClientProtocolLoader.

June 3rd, 2025

New this release:

• 🐛 (client, aws-sdk-rust#1272) Fix h2 GoAway errors not being retried by hyper legacy client

May 19th, 2025

New this release:

• 🎉 (client, smithy-rs#4135) Introduce a new repeatedly() function to aws-smithy-mocks sequence builder to build mock rules that behave as an
  infinite sequence.

  let rule = mock!(aws_sdk_s3::Client::get_object)
      .sequence()
      .http_status(503, None)
      .times(2)        // repeat the last output twice before moving onto the next response in the sequence
      .output(|| GetObjectOutput::builder()
          .body(ByteStream::from_static(b"success"))
          .build()
      )
      .repeatedly()    // repeat the last output forever
      .build();

• 🐛 (client, aws-sdk-rust#1291) Removing the optimize_crc32_auto feature flag from the crc-fast dependency of the aws-smithy-checksums crate since it was causing build issues for some customers.

• 🐛 (client, smithy-rs#4137) Fix bug with enum codegen

  When the first enum generated has the @sensitive trait the opaque type
  underlying the UnknownVariant inherits that sensitivity. This means that
  it does not derive Debug. Since the module is only generated once this
  causes a problem for non-sensitive enums that rely on the type deriving
  Debug so that they can also derive Debug. We manually add Debug to
  the module so it will always be there since the UnknownVariant is not
  modeled and cannot be @sensitive.

• 🐛 (client, smithy-rs#4135) fix simple rules behavior with RuleMode::MatchAny