fix: backport #7317 to v1

[hi-ogawa]

Description

• Backport of fix: validate websocket request #7317

It looks difficult to make CI pass now. At least, I manually tested these two works locally:

pnpm -C examples/basic test -- --ui
pnpm -C examples/basic test -- --browser.name=chromium --browser.provider=playwright

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Tests

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[AriPerkkio]

The pnpm test:types on test/coverage-test is failing here. It's picking some unrelated files. Fixing that could make the CI pass maybe 👀