Align Stage Block Content-MD5 response with Azure

[Copilot]

Stage Block omitted Content-MD5 even when clients supplied a valid MD5 checksum. Azure returns the calculated Content-MD5 for API versions after 2019-02-02, while continuing to return CRC64 when MD5 is not supplied.

• Handler behavior
  • Return calculated Content-MD5 for Stage Block requests with Content-MD5 and API version newer than 2019-02-02.
  • Preserve computed x-ms-content-crc64 responses when no MD5 is supplied.
  • Keep 2019-02-02 behavior unchanged.

contentMD5: shouldReturnContentMD5 ? calculatedContentMD5 : undefined,
xMsContentCrc64: calculatedCRC64,

• Regression coverage

  • Added focused Loki/SQL assertions for post-2019-02-02 MD5 response behavior.
  • Added coverage that 2019-02-02 still omits Content-MD5.
  • Kept existing CRC64 response behavior covered.

• Changelog

  • Added an Upcoming Release Blob entry for the Stage Block response alignment.

Original prompt

Fix Azure/Azurite issue #2394. Align Stage Block responses with Azure: for API versions after 2019-02-02, when the request supplies Content-MD5, return the already calculated MD5 as the response Content-MD5; otherwise preserve calculated CRC64 behavior. Add a focused Loki/SQL regression assertion, an Upcoming Release ChangeLog entry, and run targeted tests, build, and lint. Keep the change limited to BlockBlobHandler and its focused tests. The locally validated implementation changed src/blob/handlers/BlockBlobHandler.ts, tests/blob/apis/blockblob.test.ts, and ChangeLog.md. Include 'Fixes #2394' in the PR body.

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🟡 Changes recommended

Omitted-version handling and API-version boundary coverage remain unresolved.

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Open (1)

• Test legacy API versions for Put Block checksum behavior · New

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Copilot review overview

🟢 Approval recommended

No unresolved issues were identified, and the focused changes include regression coverage.

Review effort: Lite
Findings: None

Resolved since last review (1)

• Test legacy API versions for Put Block checksum behavior

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Copilot review overview

🔵 Needs a closer look

Targeted tests, build, and lint were not executed, so runtime validation remains pending.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues were identified; standard CI validation remains appropriate.

Review effort: Lite
Findings: None