<!-- Do not manually edit this file. Use the `changelogger` tool. -->
August 18th, 2025
=================
**New this release:**
- :tada: (client, [aws-sdk-rust#169](https://github.com/awslabs/aws-sdk-rust/issues/169)) Add support for proxy environment variables (`HTTP_PROXY, `HTTPS_PROXY`, `ALL_PROXY`, `NO_PROXY`). Service clients will now automatically respect these proxy environment variables on the latest `BehaviorVersion`. Older behavior versions do not automatically detect these environment variables and will require manually building a `aws_smithy_http_client::Connector` with a proxy config explicitly set to use this feature.
- :tada: (client, @WillChilds-Klein) Enable rustls post-quantum by default.
- (client) fix `aws-smithy-eventstream` feature `derive-arbitrary` on `arbitrary` >= 1.4.2
"message":"Add support for environment token provider for AWS services whose SigV4 service signing name matches `bedrock`. Setting this environment variable, `AWS_BEARER_TOKEN_BEDROCK`, allows SDKs to prefer the `httpBearerAuth` auth scheme and to retrieve a Token value from the said environment. Customers would use the environment variable as follows:\n```\n// export AWS_BEARER_TOKEN_BEDROCK=my-token\nlet sdk_config = aws_config::defaults(BehaviorVersion::latest()).load().await;\nlet bedrock_client = aws_sdk_bedrock::Client::new(&sdk_config);\n// call an operation on `bedrock_client`...\n```\nUnder the hood, this is equivalent roughly to\n```\nlet sdk_config = aws_config::defaults(BehaviorVersion::latest()).load().await;\nlet bedrock_config = aws_sdk_bedrock::config::Builder::from(sdk_config)\n .auth_scheme_preference([HTTP_BEARER_AUTH_SCHEME_ID])\n .token_provider(Token::new(\"my-token\", None))\n .build();\nlet bedrock_client = aws_sdk_bedrock::Client::from_conf(bedrock_config);\n// call an operation on `bedrock_client`...\n```\nHowever, note that if customers create the service client directly from the service config builder, the environment variable will not be applied:\n```\n// export AWS_BEARER_TOKEN_BEDROCK=my-token\nlet bedrock_config = aws_sdk_bedrock::Config::builder()\n // other configurations\n .build();\nlet bedrock_client = aws_sdk_bedrock::Client::from_conf(bedrock_config);\n// `bedrock_client` neither prefers HTTP_BEARER_AUTH_SCHEME_ID nor sets a Token with my-token.\n```\n",
"message":"Add the ability to insert `hints.mostly-unused = true` in Cargo.toml. Enable this hint for the below crates:\n- aws-sdk-cloudformation\n- aws-sdk-dynamodb\n- aws-sdk-ec2\n- aws-sdk-s3\n- aws-sdk-sns\n- aws-sdk-sqs\n- aws-sdk-ssm\n- aws-sdk-sts\n\nSee more information about this hint at https://blog.rust-lang.org/inside-rust/2025/07/15/call-for-testing-hint-mostly-unused/\n",
"message":"Enable `hints.mostly-unused = true` for `aws-sdk-lambda` (taking a release\nbuild from 57s to 40s) and `aws-sdk-rds` (taking a release build from 1m34s to\n49s).\n",
"message":"Add support for proxy environment variables (`HTTP_PROXY, `HTTPS_PROXY`, `ALL_PROXY`, `NO_PROXY`). Service clients will now automatically respect these proxy environment variables on the latest `BehaviorVersion`. Older behavior versions do not automatically detect these environment variables and will require manually building a `aws_smithy_http_client::Connector` with a proxy config explicitly set to use this feature.\n",
