1769635097.md

applies_to	aws-sdk-rust
authors	ysaito1001
references	smithy-rs#1798 smithy-rs#4188
breaking	false
new_feature	true
bug_fix	true

Add full support for AWS chunked content encoding. This affects S3's PutObject and UploadPart operations with streaming payloads. Streaming payloads are now split into 64 KiB chunks by default (the last chunk may be smaller) instead of being sent as a single chunk.

If the default chunk size does not suit the use case, it can be configured via the service config:

// Custom chunk size
let config = aws_sdk_s3::Config::builder()
    .chunk_size(Some(10240)) // 10 KiB chunks
    .build();
let client = aws_sdk_s3::Client::from_conf(config);

// Disable chunking (send entire content as one chunk)
let config = aws_sdk_s3::Config::builder()
    .chunk_size(None)
    .build();
let client = aws_sdk_s3::Client::from_conf(config);