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fix(core): resolve HMR WebSocket URLs from blob origins - #8709
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This was referenced Oct 22, 2026
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Motivation
When the HMR client runs under a blob URL, its location has no hostname or port and uses the
blob:protocol. Automatic WebSocket URL resolution can therefore fall back tows://localhostinstead of the server's address.Related fix in rspack-dev-server: rstackjs/rspack-dev-server#267.
Changes
Resolve blob locations from their non-opaque origin before the existing WebSocket URL formatting logic runs. Keep explicit client settings and fallback handling unchanged, with four focused tests for HTTP and HTTPS blob URLs, regular URLs, and opaque origins.