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fix(dev): return "502 Bad Gateway" on proxy failures instead of 500 #21652

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Merged
sapphi-red merged 4 commits into from
Feb 17, 2026
+10 −2
Merged

fix(dev): return "502 Bad Gateway" on proxy failures instead of 500 #21652

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3d0dd0c
Initial plan
Copilot Feb 17, 2026
ed46557
Change proxy error status code from 500 to 502 Bad Gateway
Copilot Feb 17, 2026
889abbb
Use foo.invalid instead of localhost:9608 for proxy error test
Copilot Feb 17, 2026
174c59e
chore: update
sapphi-red Feb 17, 2026
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2 changes: 1 addition & 1 deletion packages/vite/src/node/server/middlewares/proxy.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -106,7 +106,7 @@ export function proxyMiddleware(
)
if (!res.headersSent && !res.writableEnded) {
res
.writeHead(500, {
.writeHead(502, {
'Content-Type': 'text/plain',
})
.end()
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9 changes: 8 additions & 1 deletion playground/proxy-bypass/__tests__/proxy-bypass.spec.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import { expect, test, vi } from 'vitest'
import { browserLogs, page, serverLogs } from '~utils'
import { browserLogs, isServe, page, serverLogs, viteTestUrl } from '~utils'

test('proxy-bypass', async () => {
await vi.waitFor(() => {
Expand All @@ -17,3 +17,10 @@ test('async-proxy-bypass-with-error', async () => {
expect(serverLogs.join('\n')).toContain('bypass error')
})
})

test.runIf(isServe)('proxy error returns 502', async () => {
// proxyError tries to proxy to foo.invalid which doesn't exist
// This should return 502 Bad Gateway instead of 500 Internal Server Error
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const res = await fetch(viteTestUrl + '/proxyError')
expect(res.status).toBe(502)
})
3 changes: 3 additions & 0 deletions playground/proxy-bypass/vite.config.js
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Expand Up @@ -12,6 +12,9 @@ export default defineConfig({
return false
},
},
'/proxyError': {
target: 'http://foo.invalid',
},
'/asyncResponse': {
bypass: async (_, res) => {
await timeout(4)
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