FallbackInfo

  • FallbackInfo provides details on why and how a fallback routing result was used if the server deviated from the preferred routing mode.

  • This information includes the actual routing mode used (FallbackRoutingMode) and the reason for the fallback (FallbackReason).

  • FallbackRoutingMode specifies whether traffic conditions were considered in the fallback route (TRAFFIC_AWARE or TRAFFIC_UNAWARE).

  • FallbackReason clarifies if the fallback was due to a server error or exceeding the allowed calculation time.

Information related to how and why a fallback result was used. If this field is set, then it means the server used a different routing mode from your preferred mode as fallback.

JSON representation 
{
  "routingMode": enum (FallbackRoutingMode),
  "reason": enum (FallbackReason)
}
Fields
routingMode

enum (FallbackRoutingMode)

Routing mode used for the response. If fallback was triggered, the mode may be different from routing preference set in the original client request.
reason

enum (FallbackReason)

The reason why fallback response was used instead of the original response. This field is only populated when the fallback mode is triggered and the fallback response is returned.

FallbackRoutingMode

Actual routing mode used for returned fallback response.

Enums
FALLBACK_ROUTING_MODE_UNSPECIFIED Not used.
FALLBACK_TRAFFIC_UNAWARE Indicates the TRAFFIC_UNAWARE RoutingPreference was used to compute the response.
FALLBACK_TRAFFIC_AWARE Indicates the TRAFFIC_AWARE RoutingPreference was used to compute the response.

FallbackReason

Reasons for using fallback response.

Enums
FALLBACK_REASON_UNSPECIFIED No fallback reason specified.
SERVER_ERROR A server error happened while calculating routes with your preferred routing mode, but we were able to return a result calculated by an alternative mode.
LATENCY_EXCEEDED We were not able to finish the calculation with your preferred routing mode on time, but we were able to return a result calculated by an alternative mode.