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_PUBLIC_CERTIFICATE_AUTHORITY_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "publicca.googleapis.com") used byMakePublicCertificateAuthorityServiceConnection().
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 setGOOGLE_CLOUD_CPP_ENABLE_CLOGto 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 2025-09-04 UTC."],[[["\u003cp\u003eThis page details environment variables and settings for configuring the behavior of the Public Certificate Authority Service C++ library, with version 2.37.0-rc being the latest release candidate.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_PUBLIC_CERTIFICATE_AUTHORITY_SERVICE_ENDPOINT\u003c/code\u003e can override default endpoint options, allowing for customization of the service connection.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e variable turns on gRPC call tracing, and combined with \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e it outputs logs to the console.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e allows modification of gRPC tracing behavior, controlling aspects such as output formatting and field truncation.\u003c/p\u003e\n"],["\u003cp\u003eWhile \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e is used in examples and tests, it does not influence the behavior of the Public Certificate Authority Service C++ library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.33.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/publicca/latest/publicca-env)\n- [2.41.0](/cpp/docs/reference/publicca/2.41.0/publicca-env)\n- [2.40.0](/cpp/docs/reference/publicca/2.40.0/publicca-env)\n- [2.39.0](/cpp/docs/reference/publicca/2.39.0/publicca-env)\n- [2.38.0](/cpp/docs/reference/publicca/2.38.0/publicca-env)\n- [2.37.0](/cpp/docs/reference/publicca/2.37.0/publicca-env)\n- [2.36.0](/cpp/docs/reference/publicca/2.36.0/publicca-env)\n- [2.35.0](/cpp/docs/reference/publicca/2.35.0/publicca-env)\n- [2.34.0](/cpp/docs/reference/publicca/2.34.0/publicca-env)\n- [2.33.0](/cpp/docs/reference/publicca/2.33.0/publicca-env)\n- [2.32.0](/cpp/docs/reference/publicca/2.32.0/publicca-env)\n- [2.31.0](/cpp/docs/reference/publicca/2.31.0/publicca-env)\n- [2.30.0](/cpp/docs/reference/publicca/2.30.0/publicca-env)\n- [2.29.0](/cpp/docs/reference/publicca/2.29.0/publicca-env)\n- [2.28.0](/cpp/docs/reference/publicca/2.28.0/publicca-env)\n- [2.27.0](/cpp/docs/reference/publicca/2.27.0/publicca-env)\n- [2.26.0](/cpp/docs/reference/publicca/2.26.0/publicca-env)\n- [2.25.1](/cpp/docs/reference/publicca/2.25.1/publicca-env) \n\nEnvironment Variables\n=====================\n\nA 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.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_PUBLIC_CERTIFICATE_AUTHORITY_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"publicca.googleapis.com\") used by `MakePublicCertificateAuthorityServiceConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`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.\n\n###### See Also\n\n[`google::cloud::LoggingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1LoggingComponentsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library."]]
