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."],[[["The webpage provides documentation for various versions of the C++ IAP (Identity-Aware Proxy) library, with version 2.37.0-rc being the latest release candidate and 2.19.0 the current version being displayed."],["Environment variables can be used to configure the library's behavior, particularly for troubleshooting, including overriding endpoint options for `IdentityAwareProxyAdminServiceConnection` and `IdentityAwareProxyOAuthServiceConnection`."],["The library supports gRPC call tracing, which can be enabled via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to enable logging output to the program's console."],["The `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` variable allows customization of gRPC tracing behavior, such as message formatting and field truncation, while the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` enables or disables logging."],["The `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and integration tests, but does not directly affect the operation of the library."]]],[]]
