Provider Routing And Fallbacks

Config strategy={mode:'fallback'} with targets=[anthropic_vk, openai_vk, bedrock_vk]; primary is Anthropic, fallbacks fire on listed status codes.

On primary upstream failure matching on_status_codes, the gateway tries the next target in declared order. Verify the cascade by reading x-portkey-provider on the response and the per-target attempt log. Order of targets[] is the contract — do not reorder between deploys without intent.

Config strategy={mode:'loadbalance'} with targets weighted 70/20/10 across three virtual keys.

Weights are relative; gateway distributes traffic across targets in expectation matching the weights. Verify by aggregating x-portkey-provider over a representative sample. Do not expect per-request determinism — loadbalance is stochastic.

Config strategy={mode:'conditional'} with query rules routing requests with metadata.env='prod' to a paid virtual key and metadata.env='dev' to a sandbox virtual key.

Send x-portkey-metadata JSON with env on every request. Conditional strategy evaluates query rules in declared order and routes to the matched target; a default target must be set for rule-miss. Verify with trace logs that prod metadata reaches the prod target.