Fix: Fix GCP Identity Aware Proxy integration errors occurring with grpcio>1.56.0#2034

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fg91 wants to merge 2 commits intomasterfrom

fabio/fix/iap-grpc-error

Commits on Dec 8, 2023

Add proxy-authorization header eagerly instead of lazily
Fabio Grätz
committed
Adapt test
Fabio Grätz
committed