整理了一下 Istio 的 Response Flags
| 协议 | 缩写 | 备注 | 备注 |
|---|---|---|---|
| HTTP | DC | DOWNSTREAM_CONNECTION_TERMINATION | Downstream connection termination. |
| HTTP | DI | DELAY_INJECTED | The request processing was delayed for a period specified via fault injection. |
| HTTP | DPE | DOWNSTREAM_PROTOCOL_ERROR | The downstream request had an HTTP protocol error. |
| HTTP | FI | FAULT_INJECTED | The request was aborted with a response code specified via fault injection. |
| HTTP | IH | INVALID_ENVOY_REQUEST_HEADERS | The request was rejected because it set an invalid value for a strictly-checked header in addition to 400 response code. |
| HTTP | LH | FAILED_LOCAL_HEALTH_CHECK | Local service failed health check request in addition to 503 response code. |
| HTTP | LR | LOCAL_RESET | Connection local reset in addition to 503 response code. |
| HTTP/TCP | NC | NO_CLUSTER_FOUND | Upstream cluster not found. |
| HTTP/TCP | NR | NO_ROUTE_FOUND | No route configured for a given request in addition to 404 response code, or no matching filter chain for a downstream connection. |
| HTTP | RL | RATE_LIMITED | The request was ratelimited locally by the HTTP rate limit filter in addition to 429 response code. |
| HTTP | RLSE | RATELIMIT_SERVICE_ERROR | The request was rejected because there was an error in rate limit service. |
| HTTP | SI | STREAM_IDLE_TIMEOUT | Stream idle timeout in addition to 408 response code. |
| HTTP | UAEX | UNAUTHORIZED_EXTERNAL_SERVICE | The request was denied by the external authorization service. |
| HTTP | UC | UPSTREAM_CONNECTION_TERMINATION | Upstream connection termination in addition to 503 response code. |
| HTTP/TCP | UF | UPSTREAM_CONNECTION_FAILURE | Upstream connection failure in addition to 503 response code. |
| HTTP/TCP | UH | NO_HEALTHY_UPSTREAM | No healthy upstream hosts in upstream cluster in addition to 503 response code. |
| HTTP | UMSDR | UPSTREAM_MAX_STREAM_DURATION_REACHED | The upstream request reached to max stream duration. |
| HTTP/TCP | UO | UPSTREAM_OVERFLOW | Upstream overflow (circuit breaking) in addition to 503 response code. |
| HTTP | UPE | UPSTREAM_PROTOCOL_ERROR | The upstream response had an HTTP protocol error. |
| HTTP | UR | UPSTREAM_REMOTE_RESET | Upstream remote reset in addition to 503 response code. |
| HTTP/TCP | URX | UPSTREAM_RETRY_LIMIT_EXCEEDED | The request was rejected because the upstream retry limit (HTTP) or maximum connect attempts (TCP) was reached. |
| HTTP | UT | UPSTREAM_REQUEST_TIMEOUT | Upstream request timeout in addition to 504 response code. |