How passthrough API in Validate org works

I didn't find much information on usage of passthrough API which gets installed along with smartdoc installation in VALIDATE org.

Can any one provide few details on the necessity of this API? Reason for me asking for this is to understand too many errors getting reported so need to understand how so many requests are getting fired and error rate is 100% at 0.02TPS

Ref: https://docs.apigee.com/private-cloud/v4.19.01/install-smartdocs

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