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mvdbeek
27d69f9927
The browser's native EventSource auto-retry gives up once readyState flips to CLOSED — typical for a 4xx/5xx response with no text/event-stream body — and the previous onerror handler did not detect that, leaving the client stranded on the polling fallback for the rest of the session. Take ownership of the reconnect loop on the client: close the source on onerror+CLOSED, schedule a reopen with full-jitter exponential backoff capped at 30 s, and reset the counter on a successful onopen. The replay-on-open viewer-subscription path is unchanged. Tested with a Playwright-only integration_selenium test that fails the first SSE request with a 503 via page.route() and asserts the client reconnects and delivers a subsequently-pushed notification.