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A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint OverridesGOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_ADMIN_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "iap.googleapis.com") used by MakeIdentityAwareProxyAdminServiceConnection().GOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_O_AUTH_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "iap.googleapis.com") used by MakeIdentityAwareProxyOAuthServiceConnection().GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This document provides a comprehensive list of available versions for the C++ IAP (Identity-Aware Proxy) library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The library's behavior can be configured using environment variables, which are useful for troubleshooting and can also be set programmatically via functions in code."],["Endpoint overrides can be set for `IdentityAwareProxyAdminService` and `IdentityAwareProxyOAuthService` using specific environment variables, allowing for customization of the service endpoints."],["Tracing and logging features can be enabled and configured using environment variables to monitor gRPC calls and output diagnostic information to the program's console."],["There is an environment variable, `GOOGLE_CLOUD_PROJECT`, that can be set for examples and integration tests, but this is not used by the library itself."]]],[]]
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