[jayhemnani9910]

Summary / 摘要

Reading a byte range of an object through the S3 server fails in boto3 when the object was uploaded with put_object:

put_object(b1, a.txt, b"hello world")              # boto3 sends x-amz-checksum-crc32
get_object(b1, a.txt, Range="bytes=0-4")
  main:         FlexibleChecksumError: Expected checksum DUoRhQ== did not match calculated checksum: NhCmhg==
  this branch:  b'hello'

PutObject keeps the client's x-amz-* headers in b.meta, and GetObject sends them back on every response, including ranged ones. The stored x-amz-checksum-crc32 covers the whole object, so an SDK that validates checksums checks it against the partial body and rejects it. GetObject now leaves the stored X-Amz-Checksum-* entries out when it serves a range; full GETs and HEAD still return them, and other metadata is unchanged.

• This PR has breaking changes.
  / 此 PR 包含破坏性变更。
• This PR changes public API, config, storage format, or migration behavior.
  / 此 PR 修改了公开 API、配置、存储格式或迁移行为。
• This PR requires corresponding changes in related repositories.
  / 此 PR 需要关联仓库同步修改。

Related Issues / 关联 Issue

None.

Testing / 测试

• go test ./... (only pkg/aria2/rpc fails: it needs an aria2 daemon on :6800, same on main)

• Manual test / 手动测试:

• Built main and this branch, S3 server on with a bucket mapped to a local storage, boto3 1.43: bytes=0-4, bytes=-5 and bytes=6- fail on main with FlexibleChecksumError and return hello / world / world here; a full GET still returns the body and ChecksumCRC32.

• A 55-request boto3 run (listing, keys with spaces and +, metadata, copy, delete, multipart) gives the same results on main and this branch apart from the three ranged GETs.

• New TestGetObjectRangeOmitsWholeObjectChecksum fails without the change; go vet ./server/s3/ passes.

Checklist / 检查清单

• I have read CONTRIBUTING.
  / 我已阅读 CONTRIBUTING。
• I confirm this contribution follows the repository license, contribution policy, and code of conduct.
  / 我确认此贡献符合仓库许可证、贡献规范和行为准则。
• I have formatted the changed code with gofmt, go fmt, or prettier where applicable.
  / 我已按适用情况使用 gofmt、go fmt 或 prettier 格式化变更代码。
• I have requested review from relevant maintainers or code owners where applicable.
  / 我已在适用情况下请求相关维护者或代码所有者审查。

AI Disclosure / AI 使用声明

• This PR includes AI-assisted content.
  / 此 PR 包含 AI 辅助内容。

Tools used / 使用工具:

• Claude

Usage scope / 使用范围:

• Code generation / 代码生成

• Tests / 测试

• I have reviewed and validated all AI-assisted content included in this PR.
  / 我已审核并验证此 PR 中的所有 AI 辅助内容。