Failover protection is available on the Polygon network for paying customers on the Growth or Custom plan. This feature ensures API requests are fulfilled even if Infura experiences a service issue or outage. This is achieved by routing requests to a select partner.
Failover protection is enabled on a per-request basis by adding the failover header to your API request (see Enable API request forwarding). This gives you control over which requests you'd like fulfilled by Infura's partner if failover protection should be needed.
Partners and privacy policies
No personal information is sent as part of partner requests, only information necessary to fulfill your API request. This means that Infura's partner service provider can service your request, but not store the content of your request.
For any parameters required in an RPC request, these could be the type that describe the method, addresses, gas, and session.