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fix(webkit): do not report blob: URLs to route handlers #42738

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Mohan Ram (mohanram-dev) wants to merge 1 commit into from
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fix(webkit): do not report blob: URLs to route handlers #42738

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2 changes: 2 additions & 0 deletions packages/playwright-core/src/server/webkit/webview/wvPage.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1039,6 +1039,8 @@ export class WVPage implements PageDelegate {
// WebKit started dispatching network events for about:blank after https://commits.webkit.org/292206@main.
if (event.request.url.startsWith('about:'))
return;
if (event.request.url.startsWith('blob:'))
return;

// We do not support intercepting redirects.
if (this._page.needsRequestInterception() && !event.redirectResponse)
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2 changes: 2 additions & 0 deletions packages/playwright-core/src/server/webkit/wkPage.ts
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Expand Up @@ -1063,6 +1063,8 @@ export class WKPage implements PageDelegate {
// WebKit started dispatching network events for about:blank after https://commits.webkit.org/292206@main.
if (event.request.url.startsWith('about:'))
return;
if (event.request.url.startsWith('blob:'))

@dcrousso Devin Rousso (dcrousso) Sep 17, 2026

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this does a lot more than just preventing routing blob: and drops all network activity for blob:

return;

// We do not support intercepting redirects.
if (this._page.needsRequestInterception() && !event.redirectResponse)
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29 changes: 29 additions & 0 deletions tests/page/page-route.spec.ts
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Expand Up @@ -1138,3 +1138,32 @@ it('should be able to intercept every navigation to a page controlled by service
await page.goto(URL);
expect(interceptions).toBe(2);
});

it('should not report blob: urls to route handler', async ({ page, server }) => {
it.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/42727' });

const seen: string[] = [];
await page.route('**/*', route => {
seen.push(route.request().url());
return route.continue();
});
await page.goto(server.EMPTY_PAGE);
const reply = await page.evaluate(async () => {
const blob = new Blob(['self.postMessage("ready")'], { type: 'text/javascript' });
const worker = new Worker(URL.createObjectURL(blob));
return await new Promise(resolve => {
worker.onmessage = (e: any) => resolve(e.data);
});
});
expect(reply).toBe('ready');

const fetchReply = await page.evaluate(async () => {
const blob = new Blob(['hello blob'], { type: 'text/plain' });
const blobUrl = URL.createObjectURL(blob);
const res = await fetch(blobUrl);
return await res.text();
});
expect(fetchReply).toBe('hello blob');

expect(seen.filter(url => url.startsWith('blob:'))).toEqual([]);
});
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