Fix HmrServer crash when entry point uses virtual URL prefix #817

Job	Run time
Type check, lint, smoke test	56s
Tests with coverage	1m 51s
test (ubuntu-latest, lts/) / Tests [Node.js lts/, ubuntu-latest, Using yarn.lock]	1m 6s
test (windows-latest, latest) / Tests [Node.js latest, windows-latest, Using yarn.lock]	1m 41s
test (macos-latest, lts/-1) / Tests [Node.js lts/-1, macos-latest, Using yarn.lock]	1m 25s
test (macos-latest, lts/) / Tests [Node.js lts/, macos-latest, Using yarn.lock]	1m 46s
test (macos-latest, 20.19.4) / Tests [Node.js 20.19.4, macos-latest, Using yarn.lock]	1m 35s
test (ubuntu-latest, 20.19.4) / Tests [Node.js 20.19.4, ubuntu-latest, Using yarn.lock]	2m 57s
test (windows-latest, lts/-1) / Tests [Node.js lts/-1, windows-latest, Using yarn.lock]	1m 55s
test (ubuntu-latest, lts/-1) / Tests [Node.js lts/-1, ubuntu-latest, Using yarn.lock]	3m 3s
test (windows-latest, 20.19.4) / Tests [Node.js 20.19.4, windows-latest, Using yarn.lock]	1m 45s
test (macos-latest, latest) / Tests [Node.js latest, macos-latest, Using yarn.lock]	54s
test (ubuntu-latest, latest) / Tests [Node.js latest, ubuntu-latest, Using yarn.lock]	1m 4s
test (windows-latest, lts/) / Tests [Node.js lts/, windows-latest, Using yarn.lock]	1m 52s
Deploy	-1s
	23m 49s

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