Error: Cannot write headers after they are sent to the client

[sentry]

Sentry Issue: NEXU-DESKTOP-PROD-18

Error: Cannot write headers after they are sent to the client
  File "app:///dist-electron/main/index-B9LpMADZ.js", line 19765, in $V

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[lefarcen]

Hi @sentry[bot]!\n\nThis looks related to the earlier reports in #1168 and #1031, so I am linking it back to that investigation instead of treating it as a brand-new error family.\n\nCurrent likely cause: the desktop embedded server in apps/desktop/main/services/embedded-web-server.ts has a plausible double-write path. proxyToController() writes the upstream status/headers first, but if the body read fails afterwards it can still fall into the catch and try res.writeHead(502) again; the outer server handler also has a top-level catch that writes a 500 response unconditionally. Either path can produce Cannot write headers after they are sent to the client in the Electron main process.\n\nKeeping this triage linked with #1168 for now. If a later Sentry stack shows a different route or code path, we can split it back out.\n\nCommunity:\n- Feishu: https://applink.feishu.cn/client/chat/chatter/add_by_link?link_token=90emc2e9-86cd-4723-b455-ca41b70f162d\n- Discord: https://discord.gg/nexu