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::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.
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 2025-03-05 UTC."],[[["This page lists available versions of the C++ library, ranging from version 2.37.0-rc (latest) down to version 2.11.0, along with links to their respective documentation."],["Environment variables can be used to configure the library's behavior, especially useful for troubleshooting, in conjunction with functions that allow for in-code behavior configuration."],["The `GOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_ADMIN_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_IDENTITY_AWARE_PROXY_O_AUTH_SERVICE_ENDPOINT` variables can be used to override the default endpoints for specific service connections."],["Tracing and logging in gRPC calls can be enabled and configured using environment variables such as `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The environment variable `GOOGLE_CLOUD_PROJECT` can be used to set the GCP project for examples and integration tests, but has no direct effect on the library's internal operation."]]],[]]
