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fix(server): intercept ping requests #13117

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merged 2 commits into from May 8, 2023
Merged

fix(server): intercept ping requests #13117

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5d57541
fix: handle ping requests before they reach user middleware
gtm-nayan May 7, 2023
0e58633
chore: make it a named function
sapphi-red May 8, 2023
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5 changes: 5 additions & 0 deletions packages/vite/src/client/client.ts
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Expand Up @@ -321,6 +321,11 @@ async function waitForSuccessfulPing(
try {
await fetch(`${pingHostProtocol}://${hostAndPath}`, {
mode: 'no-cors',
headers: {
// Custom headers won't be included in a request with no-cors so (ab)use one of the
// safelisted headers to identify the ping request
Accept: 'text/x-vite-ping',
},
})
return true
} catch {}
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10 changes: 10 additions & 0 deletions packages/vite/src/node/server/index.ts
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Expand Up @@ -608,6 +608,16 @@ export async function _createServer(
// open in editor support
middlewares.use('/__open-in-editor', launchEditorMiddleware())

// ping request handler
// Keep the named function. The name is visible in debug logs via `DEBUG=connect:dispatcher ...`
middlewares.use(function viteHMRPingMiddleware(req, res, next) {
if (req.headers['accept'] === 'text/x-vite-ping') {
res.writeHead(204).end()
} else {
next()
}
})

// serve static files under /public
// this applies before the transform middleware so that these files are served
// as-is without transforms.
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