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_ANALYTICS_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeAnalyticsServiceConnection().
GOOGLE_CLOUD_CPP_CATALOG_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeCatalogServiceConnection().
GOOGLE_CLOUD_CPP_COMPLETION_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeCompletionServiceConnection().
GOOGLE_CLOUD_CPP_CONTROL_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeControlServiceConnection().
GOOGLE_CLOUD_CPP_MODEL_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeModelServiceConnection().
GOOGLE_CLOUD_CPP_PRODUCT_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeProductServiceConnection().
GOOGLE_CLOUD_CPP_RETAIL_PREDICTION_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakePredictionServiceConnection().
GOOGLE_CLOUD_CPP_SEARCH_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeSearchServiceConnection().
GOOGLE_CLOUD_CPP_SERVING_CONFIG_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeServingConfigServiceConnection().
GOOGLE_CLOUD_CPP_USER_EVENT_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "retail.googleapis.com") used byMakeUserEventServiceConnection().
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 document outlines various versions of the C++ retail environment, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc, with links to their respective documentation.\u003c/p\u003e\n"],["\u003cp\u003eSeveral environment variables can be used to override default endpoint settings for different services, such as Analytics, Catalog, Completion, Control, Model, Product, Prediction, Search, Serving Config, and User Event services.\u003c/p\u003e\n"],["\u003cp\u003eYou can enable tracing for gRPC calls using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, which will print gRPC requests and responses, potentially requiring \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e to display output.\u003c/p\u003e\n"],["\u003cp\u003eThe variable \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e can be utilized to customize gRPC tracing behavior, like message formatting and field truncation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e environment variable activates logging in the library, and although the library consistently "logs," no output is displayed until an application-specific backend is configured or this variable is set.\u003c/p\u003e\n"]]],[],null,["Version 2.30.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/retail/latest/retail-env)\n- [2.41.0](/cpp/docs/reference/retail/2.41.0/retail-env)\n- [2.40.0](/cpp/docs/reference/retail/2.40.0/retail-env)\n- [2.39.0](/cpp/docs/reference/retail/2.39.0/retail-env)\n- [2.38.0](/cpp/docs/reference/retail/2.38.0/retail-env)\n- [2.37.0](/cpp/docs/reference/retail/2.37.0/retail-env)\n- [2.36.0](/cpp/docs/reference/retail/2.36.0/retail-env)\n- [2.35.0](/cpp/docs/reference/retail/2.35.0/retail-env)\n- [2.34.0](/cpp/docs/reference/retail/2.34.0/retail-env)\n- [2.33.0](/cpp/docs/reference/retail/2.33.0/retail-env)\n- [2.32.0](/cpp/docs/reference/retail/2.32.0/retail-env)\n- [2.31.0](/cpp/docs/reference/retail/2.31.0/retail-env)\n- [2.30.0](/cpp/docs/reference/retail/2.30.0/retail-env)\n- [2.29.0](/cpp/docs/reference/retail/2.29.0/retail-env)\n- [2.28.0](/cpp/docs/reference/retail/2.28.0/retail-env)\n- [2.27.0](/cpp/docs/reference/retail/2.27.0/retail-env)\n- [2.26.0](/cpp/docs/reference/retail/2.26.0/retail-env)\n- [2.25.1](/cpp/docs/reference/retail/2.25.1/retail-env)\n- [2.24.0](/cpp/docs/reference/retail/2.24.0/retail-env)\n- [2.23.0](/cpp/docs/reference/retail/2.23.0/retail-env)\n- [2.22.1](/cpp/docs/reference/retail/2.22.1/retail-env)\n- [2.21.0](/cpp/docs/reference/retail/2.21.0/retail-env)\n- [2.20.0](/cpp/docs/reference/retail/2.20.0/retail-env)\n- [2.19.0](/cpp/docs/reference/retail/2.19.0/retail-env)\n- [2.18.0](/cpp/docs/reference/retail/2.18.0/retail-env)\n- [2.17.0](/cpp/docs/reference/retail/2.17.0/retail-env)\n- [2.16.0](/cpp/docs/reference/retail/2.16.0/retail-env)\n- [2.15.1](/cpp/docs/reference/retail/2.15.1/retail-env)\n- [2.14.0](/cpp/docs/reference/retail/2.14.0/retail-env)\n- [2.13.0](/cpp/docs/reference/retail/2.13.0/retail-env)\n- [2.12.0](/cpp/docs/reference/retail/2.12.0/retail-env)\n- [2.11.0](/cpp/docs/reference/retail/2.11.0/retail-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_ANALYTICS_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeAnalyticsServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_CATALOG_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeCatalogServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_COMPLETION_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeCompletionServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_CONTROL_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeControlServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_MODEL_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeModelServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_PRODUCT_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeProductServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_RETAIL_PREDICTION_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakePredictionServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_SEARCH_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeSearchServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_SERVING_CONFIG_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeServingConfigServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_USER_EVENT_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"retail.googleapis.com\") used by `MakeUserEventServiceConnection()`.\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."]]
