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- The preview page fetches a fresh copy of itself and retries once when an API request is refused with 403: another MCP process, with its own token, now answers on this port, and the recovery logic (recoverState) needs its polls to go through. The page is sent with Cache-Control: no-store. - draw.io files are served with an ETag and Cache-Control: no-cache instead of a 24 hour max-age: their names do not change between versions, so a package upgrade must reach the browser on the next preview. HEAD and If-None-Match (304) are answered. - The file read stream goes through stream.pipeline, so a read error no longer ends the MCP process and a client that leaves mid-download no longer leaks the file handle.