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_ESSENTIAL_CONTACTS_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "essentialcontacts.googleapis.com") used byMakeEssentialContactsServiceConnection().
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\u003eThe latest version available for the Essential Contacts service is 2.37.0-rc, which is accessible via the provided link, followed by a series of previous versions ranging from 2.36.0 down to 2.12.0.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables such as \u003ccode\u003eGOOGLE_CLOUD_CPP_ESSENTIAL_CONTACTS_SERVICE_ENDPOINT\u003c/code\u003e can be utilized to override the default endpoint used by \u003ccode\u003eMakeEssentialContactsServiceConnection()\u003c/code\u003e, allowing for custom configuration.\u003c/p\u003e\n"],["\u003cp\u003eTracing for gRPC calls can be enabled using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and additional logging output can be achieved by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe behavior of gRPC tracing can be modified using \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, allowing for customization such as multiline output and string/bytes field truncation.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is used to configure the GCP project in examples and integration tests, but it does not affect the library.\u003c/p\u003e\n"]]],[],null,["Version latestkeyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/essentialcontacts/latest/essentialcontacts-env)\n- [2.41.0](/cpp/docs/reference/essentialcontacts/2.41.0/essentialcontacts-env)\n- [2.40.0](/cpp/docs/reference/essentialcontacts/2.40.0/essentialcontacts-env)\n- [2.39.0](/cpp/docs/reference/essentialcontacts/2.39.0/essentialcontacts-env)\n- [2.38.0](/cpp/docs/reference/essentialcontacts/2.38.0/essentialcontacts-env)\n- [2.37.0](/cpp/docs/reference/essentialcontacts/2.37.0/essentialcontacts-env)\n- [2.36.0](/cpp/docs/reference/essentialcontacts/2.36.0/essentialcontacts-env)\n- [2.35.0](/cpp/docs/reference/essentialcontacts/2.35.0/essentialcontacts-env)\n- [2.34.0](/cpp/docs/reference/essentialcontacts/2.34.0/essentialcontacts-env)\n- [2.33.0](/cpp/docs/reference/essentialcontacts/2.33.0/essentialcontacts-env)\n- [2.32.0](/cpp/docs/reference/essentialcontacts/2.32.0/essentialcontacts-env)\n- [2.31.0](/cpp/docs/reference/essentialcontacts/2.31.0/essentialcontacts-env)\n- [2.30.0](/cpp/docs/reference/essentialcontacts/2.30.0/essentialcontacts-env)\n- [2.29.0](/cpp/docs/reference/essentialcontacts/2.29.0/essentialcontacts-env)\n- [2.28.0](/cpp/docs/reference/essentialcontacts/2.28.0/essentialcontacts-env)\n- [2.27.0](/cpp/docs/reference/essentialcontacts/2.27.0/essentialcontacts-env)\n- [2.26.0](/cpp/docs/reference/essentialcontacts/2.26.0/essentialcontacts-env)\n- [2.25.1](/cpp/docs/reference/essentialcontacts/2.25.1/essentialcontacts-env)\n- [2.24.0](/cpp/docs/reference/essentialcontacts/2.24.0/essentialcontacts-env)\n- [2.23.0](/cpp/docs/reference/essentialcontacts/2.23.0/essentialcontacts-env)\n- [2.22.1](/cpp/docs/reference/essentialcontacts/2.22.1/essentialcontacts-env)\n- [2.21.0](/cpp/docs/reference/essentialcontacts/2.21.0/essentialcontacts-env)\n- [2.20.0](/cpp/docs/reference/essentialcontacts/2.20.0/essentialcontacts-env)\n- [2.19.0](/cpp/docs/reference/essentialcontacts/2.19.0/essentialcontacts-env)\n- [2.18.0](/cpp/docs/reference/essentialcontacts/2.18.0/essentialcontacts-env)\n- [2.17.0](/cpp/docs/reference/essentialcontacts/2.17.0/essentialcontacts-env)\n- [2.16.0](/cpp/docs/reference/essentialcontacts/2.16.0/essentialcontacts-env)\n- [2.15.1](/cpp/docs/reference/essentialcontacts/2.15.1/essentialcontacts-env)\n- [2.14.0](/cpp/docs/reference/essentialcontacts/2.14.0/essentialcontacts-env)\n- [2.13.0](/cpp/docs/reference/essentialcontacts/2.13.0/essentialcontacts-env)\n- [2.12.0](/cpp/docs/reference/essentialcontacts/2.12.0/essentialcontacts-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_ESSENTIAL_CONTACTS_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"essentialcontacts.googleapis.com\") used by `MakeEssentialContactsServiceConnection()`.\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."]]
