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fix: await init on every request to prevent race condition #16467

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Merged
Rich-Harris merged 1 commit into from
Jul 22, 2026
Merged

fix: await init on every request to prevent race condition #16467

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6 changes: 6 additions & 0 deletions .changeset/spotty-pandas-wait.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
'@sveltejs/adapter-netlify': patch
'@sveltejs/adapter-vercel': patch
---

fix: await `init` on every request to prevent race condition
4 changes: 3 additions & 1 deletion packages/adapter-netlify/src/edge.js
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Expand Up @@ -31,9 +31,11 @@ const initialized = server.init({
export default async function handler(request, context) {
if (!origin) {
origin = new URL(request.url).origin;
await initialized;
}

// always await initialization to prevent race condition with concurrent requests
await initialized;

return server.respond(request, {
platform: { context },
getClientAddress() {
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4 changes: 3 additions & 1 deletion packages/adapter-vercel/files/edge.js
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Expand Up @@ -54,9 +54,11 @@ const initialized = server.init({
export default async (request, context) => {
if (!origin) {
origin = new URL(request.url).origin;
await initialized;
}

// always await initialization to prevent race condition with concurrent requests
await initialized;

return server.respond(request, {
getClientAddress() {
return /** @type {string} */ (request.headers.get('x-forwarded-for'));
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