# rpc 错误：code = Internal desc = transport: 传输正在关闭

- **ID:** `go/grpc-internal-transport-closing`
- **领域:** go
- **类别:** network_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

RPC 进行中时底层 HTTP/2 传输被关闭。原因包括服务端关闭、keepalive 超时，或代理（如 Envoy）关闭空闲连接。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| google.golang.org/grpc 1.x | active | — | — |

## 解决方案

1. **** (85% 成功率)
   ```
   conn, _ := grpc.Dial(addr,
    grpc.WithKeepaliveParams(keepalive.ClientParameters{
        Time:                30 * time.Second,
        Timeout:             10 * time.Second,
        PermitWithoutStream: true,
    }),
)
   ```
2. **** (80% 成功率)
   ```
   for {
    resp, err := client.Get(ctx, req)
    if err == nil { return resp, nil }
    c := status.Code(err)
    if c != codes.Internal && c != codes.Unavailable { return nil, err }
    time.Sleep(backoff.NextBackOff())
}
   ```

## 无效尝试

- **** — The response body is empty; downstream code will fail parsing nil/empty data. (90% 失败率)
- **** — WithBlock only affects initial dial; it does not prevent mid-call transport closure. (80% 失败率)