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Brad Fitzpatrick
886d1b2e63
When a map poll's context is canceled mid-read, the error that surfaces from the response body read depends on the transport and Go version: Go 1.26's http2 returned the context error, while Go 1.27's returns the underlying "use of closed network connection". Normalize the read-error paths in sendMapRequest to report ctx.Err() when the context was canceled so callers see a stable, meaningful error regardless of Go version. Updates #20220 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I5898d3f452a2e61cfdf3ee015386365943c08e70