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 Overrides
GOOGLE_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.
See Also
google::cloud::TracingComponentsOptionGOOGLE_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.
See Also
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.
[[["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 2025-04-17 UTC."],[[["This page lists available versions of the C++ library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc, providing links to the documentation for each."],["Environment variables can be used to configure the C++ library's behavior, offering a convenient way to adjust settings, especially when troubleshooting."],["`GOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_ADMIN_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_O_AUTH_SERVICE_ENDPOINT` can override the default endpoint for the Identity Aware Proxy service."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which also utilizes `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to output the traces to the console, and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` is used to modify the behavior of gRPC tracing."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` allows the application to set a backend for library logging or will default to the console, while `GOOGLE_CLOUD_PROJECT` can be set for testing and examples, but has no effect on library behavior."]]],[]]
