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Chris Lu
843e4b7cdb
Address coderabbit review (line 165 / second pass on PR 9424): when the POST leg fails or returns an error status, closing pipeReader only fails the producer's *writes*. ReadUrlAsStream's own read loop runs under the parent ctx, so it keeps draining the source body in the background until EOF — wasting source-volume bandwidth and CPU on a copy that's already failed. Wrap streamCopyChunkRange in a child context cancelled on return. ReadUrlAsStream checks ctx.Done() per 256 KiB tick, so the in-flight read aborts on the next iteration once the function returns. The POST also moves to streamCtx so the in-flight request can be cancelled the same way if the producer fails first. Defer-cancel runs after both legs return, so the success path still sends EOF cleanly through pipeWriter.Close before cancellation.