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fix: ensure req.url matches moduleByEtag URL to avoid incorrect 304 r… #17997

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Sep 10, 2024
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5 changes: 4 additions & 1 deletion packages/vite/src/node/server/middlewares/transform.ts
Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,10 @@ export function cachedTransformMiddleware(
const ifNoneMatch = req.headers['if-none-match']
if (ifNoneMatch) {
const moduleByEtag = environment.moduleGraph.getModuleByEtag(ifNoneMatch)
if (moduleByEtag?.transformResult?.etag === ifNoneMatch) {
if (
moduleByEtag?.transformResult?.etag === ifNoneMatch &&
moduleByEtag?.url === req.url
) {
// For CSS requests, if the same CSS file is imported in a module,
// the browser sends the request for the direct CSS request with the etag
// from the imported CSS module. We ignore the etag in this case.
Expand Down