bug: an object-store 404 with an empty reason phrase makes a missing transcript a 502 instead of a 404

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typescript
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backend

调研方向

从 apps/webapp/app/v3/objectStoreClient.server.ts:135-141 入手，这里 getObjectResponse 抛出错误时只使用 response.statusText；以及 apps/webjapp/app/services/realtime/transcriptDownload.server.ts:46-54 中的 isTranscriptNotFound，它用固定的 "Not Found" 正则匹配消息。将 response.status 带到抛出的错误上，并让 isTranscriptNotFound 先检查 status。在 transcriptDownload.server.test.ts 中添加回归测试，使用一个返回 HTTP/1.1 404 \r\nContent-Length: 0\r\n\r\n 的本地 TCP 服务器；当该测试通过，且 transcript 测试套件、oxfmt、oxlint 和 webapp typecheck 均保持绿色时即为完成。注意：关联的 PR #4987 已存在（已关闭、未合并），作者表示本地已有修复，因此开始前请先确认该 issue 尚无人认领。

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描述

Provide environment information

Not environment-specific: found in the webapp source at main @ c2b7a72180 and reproduced with the webapp's own Vitest suite (macOS arm64, pnpm).

Describe the bug

A missing transcript can return 502 instead of 404 when the object store's 404 response has an empty reason phrase.

  • Aws4FetchClient.getObjectResponse (apps/webapp/app/v3/objectStoreClient.server.ts:135-141) throws an error built only from response.statusText and discards response.status:

    throw new Error(`Failed to download from object store: ${response.statusText}`);

  • isTranscriptNotFound (apps/webapp/app/services/realtime/transcriptDownload.server.ts:46-54) recognizes this adapter's missing object only by matching the message against /^Failed to download(?: range)? from object store: Not Found$/.

A valid HTTP/1.1 404 with no reason phrase gives the message Failed to download from object store: . It isn't classified as not found, so the route answers with a download failure (502).

Expected: a 404 from the object store is recognized by its status code, whatever the reason phrase says.

Reproduction repo

N/A (test against this repo, below)

To reproduce

In transcriptDownload.server.test.ts, start a local TCP server that replies HTTP/1.1 404 \r\nContent-Length: 0\r\n\r\n. Point ObjectStoreClient.create({ baseUrl: "http://127.0.0.1:<port>", service: "s3", ... }) at it, then:

await expect(client.getObjectResponse(key)).rejects.toSatisfy(isTranscriptNotFound);

On main this fails, because the error message is Failed to download from object store: and it isn't recognized.

Additional information

A fix with this regression test and a .server-changes note is ready locally:

  • the thrown error carries status: 404;
  • isTranscriptNotFound checks the status first.

The transcript suite (8 passed), oxfmt, oxlint and webapp typecheck pass. I'll open it as a draft PR with fixes #<this> once the account is vouched.

Prepared with AI assistance (Claude) from the breken-ai account.

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