fix(files): HEAD-safe attachment getHandler by riderx · Pull Request #3362 · Cap-go/capgo.app

riderx · 2026-09-17T07:38:40Z

Summary (AI generated)

Make /files/read/attachments HEAD-safe on the workerd/R2 path in getHandler.
HEAD miss: headFirstExistingAttachmentCandidate / R2 head() only — never bucket.get() a full bundle stream then strip the body.
HEAD response: new Response(null, { status: 200, headers }) with Content-Length from R2 head metadata (object.size), plus etag, checksum, cache-control, and Content-Disposition.
HEAD cache hit (Cache API): strip cached GET body via toHeadersOnlyResponse, preserve headers/Content-Length; background R2 restore still clones the cached GET body.
GET: unchanged — streams body, tracks bandwidth, writes Cache API entries.
Soft-delete: isAttachmentVersionDeleted still runs before serve (fail-open on Hyperdrive blips unchanged).
Add unit tests for HEAD R2 miss, HEAD cache hit, GET body, deleted-version 404s.

Motivation (AI generated)

On Cloudflare Workers / HTTP2, returning a GET body (or mismatched Content-Length) for HEAD on the workerd/R2 attachment read path caused intermittent empty 500s, timeouts, and Content-Length protocol errors. GET zip downloads worked, but iOS clients probing bundle size via HEAD failed (e.g. Extracadabra on plugin 8.43.8). Supabase-storage fallback already distinguished HEAD vs GET; this aligns workerd/R2 behavior and avoids downloading ~6.7MB just to discard it.

Business Impact (AI generated)

Restores reliable bundle size probes and HEAD checks for OTA clients on Cloudflare without affecting GET downloads. Reduces intermittent download failures and support noise for customers using HEAD before ranged GET fetches.

Follow-up (out of scope) (AI generated)

CachedFiles worker cache: isCacheableAttachmentRead in cloudflare_workers/files/index.ts only caches GET (no Range). HEAD never hits that worker cache today. This PR fixes getHandler only; optionally allowing HEAD to reuse GET-cached metadata headers (no body) in CachedFiles can be a separate follow-up.
Hyperdrive deleted-lookup caching (fix(files): fail open when deleted-bundle lookup errors #3257 semantics unchanged).

Test Plan (AI generated)

bunx vitest run tests/files-head-read.unit.test.ts tests/files-bandwidth.unit.test.ts tests/files-deleted-cache.unit.test.ts
bun run typecheck:backend
CI functional jobs green (CodSpeed perf analysis may flake unrelated)
Verify HEAD on workerd returns 200, empty body, correct Content-Length from R2 head metadata
Verify GET still returns body and tracks bandwidth
Verify deleted bundle versions still 404 on HEAD and GET

Generated with AI

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Summary by CodeRabbit

Improvements
- File metadata requests now return headers without downloading file contents.
- Responses include accurate content length and range information for full and partial files.
- Missing or deleted files return a not-found response.
- Invalid or unsatisfiable ranges return an appropriate range error.
- Standard file downloads continue to return their contents while preserving bandwidth tracking and caching behavior.
- Metadata requests for cached files also avoid returning file bodies.

coderabbitai · 2026-09-17T07:38:48Z

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supabase/functions/_backend/files/files.ts
tests/files-head-read.unit.test.ts

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📝 Walkthrough

Walkthrough

The files endpoint now returns header-only responses for HEAD requests across Supabase, cache, and R2 reads. R2 HEAD requests use object metadata. GET requests retain body and bandwidth behavior.

Changes

HEAD Attachment Reads

Layer / File(s)	Summary
Shared HEAD response handling `supabase/functions/_backend/files/files.ts`	The endpoint detects HEAD requests and omits bodies from Supabase, cached, and out-of-range responses while preserving status and headers.
R2 metadata-only reads `supabase/functions/_backend/files/files.ts`	R2 HEAD requests use metadata lookup and return 404, 503, full-file headers, or range headers without downloading the object body.
HEAD and GET endpoint tests `tests/files-head-read.unit.test.ts`	Unit tests cover R2 cache misses, cache hits, range handling, GET bodies and bandwidth tracking, and deleted-version responses.

Priority: ⚪ Pending latest changes

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant getHandler
  participant RetryBucket
  Client->>getHandler: HEAD attachment request
  getHandler->>RetryBucket: Request object metadata
  RetryBucket-->>getHandler: Object metadata or missing object
  getHandler-->>Client: Headers-only response

Merge Risk: ⚪ Minimal · up to b4606

HEAD range requests now return correct partial or invalid-range responses, and no actionable regression remains in the reviewed paths. The change is ready to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: making the attachment getHandler safe for HEAD requests.
Description check	✅ Passed	The description explains the change, motivation, impact, and test plan. It omits the checklist and leaves manual verification items unchecked, but it is otherwise substantially complete; screenshots a…

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github-actions · 2026-09-17T07:39:15Z

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codspeed · 2026-09-17T07:40:20Z

Merging this PR will not alter performance

✅ 43 untouched benchmarks
⏩ 2 skipped benchmarks¹

_{Comparing cursor/fix-files-head-attachment-gethandler-0627 (1d4b466) with main (755a759)}

2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

github-actions · 2026-09-17T07:47:05Z

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github-actions · 2026-09-17T07:58:39Z

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github-actions · 2026-09-17T08:15:43Z

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TorichanCapgo · 2026-09-17T08:16:27Z

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github-actions · 2026-09-17T08:24:44Z

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Actionable comments posted: 1

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Inline comments:
In `@supabase/functions/_backend/files/files.ts`:
- Around line 537-545: Update the HEAD range handling around
rangeHeaderFromRequest and rangeMatch to support suffix ranges such as
bytes=-500 by resolving them against objectInfo.size, while preserving normal
bounded ranges. Validate that the resolved range is satisfiable and not
reversed; otherwise return status 416 with Content-Range set to bytes */<size>.
Only emit the current 206 headers and response for valid ranges, keeping HEAD
behavior consistent with the GET path.

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coderabbitai · 2026-09-17T08:43:08Z

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Actionable comments posted: 1

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Inline comments:
In `@tests/files-head-read.unit.test.ts`:
- Line 116: Add focused tests in the R2 HEAD test suite around the existing
successful case: mock retryHeadMock returning null and rejecting, asserting 404
and 503 respectively. Also add bounded, open-ended, suffix, reversed, and
unsatisfiable range cases for HEAD, verifying the expected 206 responses and
parser edge behavior without relying on GET coverage.

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github-actions · 2026-09-17T12:06:45Z

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rihoarvutikonto

HEAD 200/206 are bodyless; HEAD 404 still ships JSON, which reopens the Content-Length issue this PR is meant to close.

Rebase Extracadabra #3362 onto current main so CRITICAL published-CLI contract picks up request_actor_email_adress. Keep HEAD responses body-less on R2/workerd attachment reads.

TorichanCapgo · 2026-09-23T09:28:11Z

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CR: miss/deleted/bucket-null paths still used c.json on HEAD, which puts a body + Content-Length on the same HTTP/2 trap as 200 hits. Return null-body 404 for HEAD; keep JSON 404 for GET.

TorichanCapgo · 2026-09-23T09:39:57Z

Fixed on tip: HEAD attachment misses (R2 null, deleted version, bucket null, supabase storage 404) now return body-less 404 via notFoundAttachmentResponse. GET still JSON. @coderabbitai review

github-actions · 2026-09-23T09:40:00Z

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coderabbitai · 2026-09-23T09:41:02Z

@TorichanCapgo Thanks for the update. I’ll review the latest changes, including body-less 404 responses for HEAD attachment misses and JSON responses for GET.

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typecheck: method was referenced in the signed-URL 404 branch before its const declaration.

TorichanCapgo · 2026-09-23T09:47:00Z

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coderabbitai · 2026-09-23T09:47:30Z

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rihoarvutikonto

R2 HEAD 404s are body-less now. The Supabase signed-URL 404 path reads method before it's declared.

sonarqubecloud · 2026-09-23T09:52:01Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

github-actions · 2026-09-23T09:59:28Z

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riderx deployed to deepsec-pr September 17, 2026 07:38 — with GitHub Actions Active

cursor Bot deployed to deepsec-pr September 17, 2026 07:47 Active

cursor Bot deployed to deepsec-pr September 17, 2026 07:58 Active

riderx marked this pull request as ready for review September 17, 2026 08:13

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Comment thread supabase/functions/_backend/files/files.ts Outdated

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Comment thread tests/files-head-read.unit.test.ts

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TorichanCapgo added a commit that referenced this pull request Sep 19, 2026

chore: empty tip refresh for plugin-serial flake (#3362)

b460608

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Comment thread supabase/functions/_backend/files/files.ts Outdated

fix(files): HEAD-safe attachment getHandler

e819d2a

Rebase Extracadabra #3362 onto current main so CRITICAL published-CLI contract picks up request_actor_email_adress. Keep HEAD responses body-less on R2/workerd attachment reads.

TorichanCapgo force-pushed the cursor/fix-files-head-attachment-gethandler-0627 branch from b460608 to e819d2a Compare September 23, 2026 09:28

TorichanCapgo deployed to deepsec-pr September 23, 2026 09:28 — with GitHub Actions Active

fix(files): keep HEAD attachment 404s body-less

087e609

CR: miss/deleted/bucket-null paths still used c.json on HEAD, which puts a body + Content-Length on the same HTTP/2 trap as 200 hits. Return null-body 404 for HEAD; keep JSON 404 for GET.

TorichanCapgo deployed to deepsec-pr September 23, 2026 09:39 — with GitHub Actions Active

rihoarvutikonto mentioned this pull request Sep 23, 2026

feat(billing): dual Stripe EE/US account support #3283

Open

3 tasks

fix(files): declare HEAD method before supabase 404 path

1d4b466

typecheck: method was referenced in the signed-URL 404 branch before its const declaration.

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Comment thread supabase/functions/_backend/files/files.ts

riderx merged commit 204bfc0 into main Sep 23, 2026
168 of 172 checks passed

riderx deleted the cursor/fix-files-head-attachment-gethandler-0627 branch September 23, 2026 13:34

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