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fix(http-client-js): serialize form-urlencoded bodies with URLSearchParams - #12412
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Joel Town Road (hippi345) wants to merge 1 commit into
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Joel Town Road (hippi345) wants to merge 1 commit into
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…arams Request bodies with content type application/x-www-form-urlencoded were sent through the JSON transport transform. Encode those model and record bodies with URLSearchParams instead.
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🟡 Changes recommended
Nullable form bodies still bypass encoding, and form-specific field names are mishandled for named models and parameterized content types.
3 open issues
What changed in this PR
Fixes #12349 by adding URL-encoded request-body serialization to the JavaScript HTTP client emitter instead of sending JSON under a form content type.
Changes:
- Adds a conditional
URLSearchParamshelper that skips absent values, repeats array keys, and JSON-encodes nested objects. - Routes model and record form bodies through the helper.
- Adds emitter scenarios and a changelog entry.
| File | Description |
|---|---|
packages/http-client-js/test/scenarios/http-operations/form-urlencoded-body.md |
Adds record and model form-body scenarios. |
packages/http-client-js/src/utils/form-urlencoded.ts |
Detects form content types, including parameters. |
packages/http-client-js/src/emitter.tsx |
Registers conditional form-helper emission. |
packages/http-client-js/src/components/transforms/operation-transform-expression.tsx |
Wraps form-body transforms with the encoder. |
packages/http-client-js/src/components/static-helpers/form-urlencoded.tsx |
Generates the form encoder when needed. |
packages/http-client-js/src/components/index.ts |
Exports the helper component. |
.chronus/changes/fix-12349-form-urlencoded-2026-9-27-19-55-38.md |
Records the serialization fix. |
Review effort: Balanced
| const payloadType = body.type; | ||
| if ( | ||
| body.bodyKind === "single" && | ||
| payloadType.kind === "Model" && |
| <ContentTypeEncodingProvider contentType={contentType}> | ||
| <TransformNamePolicyContext.Provider | ||
| value={{ | ||
| getTransportName: (type) => defaultTransportNameGetter(type, contentType), |
| }} | ||
| > | ||
| {code`${getEncodeFormUrlEncodedRef()}(${( | ||
| <JsonTransform itemRef={itemRef} target="transport" type={payloadType} /> |
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Summary
Fixes #12349.
@typespec/http-client-jssentapplication/x-www-form-urlencodedrequest bodies through the JSON transport transform, so the runtime posted JSON under a form content type. Those model and record bodies are now encoded withURLSearchParams.The generated
encodeFormUrlEncodedhelper skips null and undefined values, repeats keys for arrays, and JSON-encodes nested objects. Emitter scenarios cover aRecord<string>body and a model body.Test plan
pnpm --filter @typespec/http-client-js buildpnpm --filter @typespec/http-client-js testpnpm --filter @typespec/http-client-js lint