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.
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_UNAWARERoutingPreference was used to compute the response.
FALLBACK_TRAFFIC_AWARE
Indicates the TRAFFIC_AWARERoutingPreference 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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-11-26 UTC."],[[["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."]]],["The server may use a fallback routing mode if the preferred mode fails. This fallback information is provided in JSON format, including the `routingMode` used and the `reason` for the fallback. The `routingMode` can be `FALLBACK_TRAFFIC_UNAWARE` or `FALLBACK_TRAFFIC_AWARE`. The `reason` can be `SERVER_ERROR` (due to an internal error) or `LATENCY_EXCEEDED` (calculation exceeded the allowed time). Specific enumerations define the exact fallback mode and reason used.\n"]]
