fix(fetch): accept a Proxy as a Headers record init - #10275
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new Headers(new Proxy({ 'x-a': '1' }, {})) raised "Headers constructor:
init is not iterable": the record path required a plain heap object, and a
proxy value is a proxy id rather than one, so neither the iterable nor the
record branch applied. Read a proxied init's own string keys and values
through its ownKeys/get traps instead, matching how the spec reads a record
init through the object's internal methods.
js_headers_init_from_value additionally treated any init as a possible
Headers handle before that: a proxy's NaN-box was masked into a registry id
and could alias a live Headers entry, copying the wrong headers. Proxies now
skip that shortcut.
Unblocks OpenCode's request path, where the AI SDK hands the fetch layer a
proxied header record (PerryTS#10107).
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ChangesProxy Headers Record Initialization
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Low Sequence Diagram(s)sequenceDiagram
participant HeadersConstructor
participant ProxyObject
participant HeaderEntries
HeadersConstructor->>ProxyObject: ownKeys()
ProxyObject-->>HeadersConstructor: own keys
HeadersConstructor->>ProxyObject: get(key)
ProxyObject-->>HeadersConstructor: value
HeadersConstructor->>HeaderEntries: create header entries
Merge Risk: 🔵 Low · up to A narrow class of proxied records can produce unintended request headers; the issue is localized and suitable for bounded follow-up. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@crates/perry-stdlib/src/fetch/headers.rs`:
- Around line 170-171: Update the Proxy header-key processing near js_proxy_get
to query each key’s own property descriptor first, reuse the established
descriptor/enumerability sequence from the object allocation path, and read the
value only when a descriptor exists and is enumerable; otherwise skip the key
without invoking the get trap. Add regressions covering a non-enumerable target
property and a descriptor trap returning undefined.
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| /// is not re-queried per key: `ownKeys` on a plain wrapping Proxy already | ||
| /// reports the target's own keys, and a trap that hides a key omits it there. |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Check property descriptors before reading Proxy keys.
[[OwnPropertyKeys]] includes non-enumerable keys. A Web IDL record must call [[GetOwnProperty]] and read a value only when the descriptor exists and is enumerable. The current path adds non-enumerable headers and calls the get trap for keys hidden by getOwnPropertyDescriptor. (webidl.spec.whatwg.org)
Add the descriptor check before js_proxy_get. Reuse the descriptor and enumerability sequence in crates/perry-runtime/src/object/alloc.rs:1404-1480. Add regressions for a non-enumerable target property and a descriptor trap that returns undefined.
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In `@crates/perry-stdlib/src/fetch/headers.rs` around lines 170 - 171, Update the
Proxy header-key processing near js_proxy_get to query each key’s own property
descriptor first, reuse the established descriptor/enumerability sequence from
the object allocation path, and read the value only when a descriptor exists and
is enumerable; otherwise skip the key without invoking the get trap. Add
regressions covering a non-enumerable target property and a descriptor trap
returning undefined.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr.
"Headers constructor: init is not iterable" said nothing about what was passed, which made a failing app (OpenCode's request path) impossible to diagnose without a symbol build. The message now carries a short description of the value — string, Proxy, array, Map, Set, object, or a raw tag for non-heap values — computed only on the error path.
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Landed via merge train #10277 (v0.5.1571). Source changes preserve authorship, and the merged main tree matches the validated train exactly. |
1 participant
Problem
The record branch in
crates/perry-stdlib/src/fetch/headers.rsrequired the init to be a plainGC_TYPE_OBJECTheap object. A proxy value is a proxy id, so it matched neither that branch nor the iterable branch, and the constructor reported the init as not iterable.A second, quieter bug sat just above it:
js_headers_init_from_valuemasked any init's NaN-box into aHEADERS_REGISTRYid before the record path ran, so a proxy could alias a liveHeadersentry and copy the wrong headers (or none).OpenCode hits this on every
run: the AI SDK hands the fetch layer a proxied header record (tracker #10107).Fix
Read a proxied init's own string keys and their values through the proxy's
ownKeysandgettraps — which is how the spec reads a record init through the object's internal methods — and skip the handle shortcut for proxies. Symbol keys are ignored (a header name is a string). Plain objects, arrays, maps, sets and string inits are untouched.Verification (Linux x86_64, release build)
New
crates/perry/tests/headers_proxy_record_init.rscompiles and runs an eight-case probe and compares it to bun 1.3.14's output verbatim: plain proxy,gettrap,ownKeystrap hiding a key, proxy over an empty object, nested proxy, and the plain-object / array / map inits as controls. All match.cargo test -p perry-stdlib --lib fetchpasses (16),cargo fmt --all -- --checkandscripts/check_file_size.shclean.Deliberately out of scope (filed separately)
Array.from()over a Proxy wrapping an array segfaults; that also blocksnew Headers(new Proxy([["a","1"]], {})).new Request(url, { headers: <proxy> })silently drops the headers; the Request init takes a different path.Summary by CodeRabbit
Bug Fixes
Headersnow accepts objects wrapped in aProxyfor record-based initialization.getandownKeysbehavior and nested proxies.Documentation