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_DOCUMENT_LINK_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakeDocumentLinkServiceConnection().
GOOGLE_CLOUD_CPP_DOCUMENT_SCHEMA_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakeDocumentSchemaServiceConnection().
GOOGLE_CLOUD_CPP_DOCUMENT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakeDocumentServiceConnection().
GOOGLE_CLOUD_CPP_PIPELINE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakePipelineServiceConnection().
GOOGLE_CLOUD_CPP_RULE_SET_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakeRuleSetServiceConnection().
GOOGLE_CLOUD_CPP_SYNONYM_SET_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "contentwarehouse.googleapis.com") used by MakeSynonymSetServiceConnection().
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe latest release candidate version is 2.37.0-rc, and the current stable version is 2.36.0, with links provided for previous versions ranging down to 2.12.0.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be used to configure library behavior, including overriding service endpoints such as \u003ccode\u003eGOOGLE_CLOUD_CPP_DOCUMENT_LINK_SERVICE_ENDPOINT\u003c/code\u003e for document links, and \u003ccode\u003eGOOGLE_CLOUD_CPP_DOCUMENT_SCHEMA_SERVICE_ENDPOINT\u003c/code\u003e for document schema.\u003c/p\u003e\n"],["\u003cp\u003eTracing can be enabled for gRPC calls using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and logging can be turned on using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e, both of which allow for debugging and analysis of requests and responses.\u003c/p\u003e\n"],["\u003cp\u003eThe variable \u003ccode\u003eGOOGLE_CLOUD_PROJECT=...\u003c/code\u003e can be set for examples and integration tests to specify the GCP project, but this does not directly affect the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.36.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/contentwarehouse/latest/contentwarehouse-env)\n- [2.41.0](/cpp/docs/reference/contentwarehouse/2.41.0/contentwarehouse-env)\n- [2.40.0](/cpp/docs/reference/contentwarehouse/2.40.0/contentwarehouse-env)\n- [2.39.0](/cpp/docs/reference/contentwarehouse/2.39.0/contentwarehouse-env)\n- [2.38.0](/cpp/docs/reference/contentwarehouse/2.38.0/contentwarehouse-env)\n- [2.37.0](/cpp/docs/reference/contentwarehouse/2.37.0/contentwarehouse-env)\n- [2.36.0](/cpp/docs/reference/contentwarehouse/2.36.0/contentwarehouse-env)\n- [2.35.0](/cpp/docs/reference/contentwarehouse/2.35.0/contentwarehouse-env)\n- [2.34.0](/cpp/docs/reference/contentwarehouse/2.34.0/contentwarehouse-env)\n- [2.33.0](/cpp/docs/reference/contentwarehouse/2.33.0/contentwarehouse-env)\n- [2.32.0](/cpp/docs/reference/contentwarehouse/2.32.0/contentwarehouse-env)\n- [2.31.0](/cpp/docs/reference/contentwarehouse/2.31.0/contentwarehouse-env)\n- [2.30.0](/cpp/docs/reference/contentwarehouse/2.30.0/contentwarehouse-env)\n- [2.29.0](/cpp/docs/reference/contentwarehouse/2.29.0/contentwarehouse-env)\n- [2.28.0](/cpp/docs/reference/contentwarehouse/2.28.0/contentwarehouse-env)\n- [2.27.0](/cpp/docs/reference/contentwarehouse/2.27.0/contentwarehouse-env)\n- [2.26.0](/cpp/docs/reference/contentwarehouse/2.26.0/contentwarehouse-env)\n- [2.25.1](/cpp/docs/reference/contentwarehouse/2.25.1/contentwarehouse-env)\n- [2.24.0](/cpp/docs/reference/contentwarehouse/2.24.0/contentwarehouse-env)\n- [2.23.0](/cpp/docs/reference/contentwarehouse/2.23.0/contentwarehouse-env)\n- [2.22.1](/cpp/docs/reference/contentwarehouse/2.22.1/contentwarehouse-env)\n- [2.21.0](/cpp/docs/reference/contentwarehouse/2.21.0/contentwarehouse-env)\n- [2.20.0](/cpp/docs/reference/contentwarehouse/2.20.0/contentwarehouse-env)\n- [2.19.0](/cpp/docs/reference/contentwarehouse/2.19.0/contentwarehouse-env)\n- [2.18.0](/cpp/docs/reference/contentwarehouse/2.18.0/contentwarehouse-env)\n- [2.17.0](/cpp/docs/reference/contentwarehouse/2.17.0/contentwarehouse-env)\n- [2.16.0](/cpp/docs/reference/contentwarehouse/2.16.0/contentwarehouse-env)\n- [2.15.1](/cpp/docs/reference/contentwarehouse/2.15.1/contentwarehouse-env)\n- [2.14.0](/cpp/docs/reference/contentwarehouse/2.14.0/contentwarehouse-env)\n- [2.13.0](/cpp/docs/reference/contentwarehouse/2.13.0/contentwarehouse-env)\n- [2.12.0](/cpp/docs/reference/contentwarehouse/2.12.0/contentwarehouse-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_DOCUMENT_LINK_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakeDocumentLinkServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_DOCUMENT_SCHEMA_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakeDocumentSchemaServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_DOCUMENT_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakeDocumentServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_PIPELINE_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakePipelineServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_RULE_SET_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakeRuleSetServiceConnection()`.\n- `GOOGLE_CLOUD_CPP_SYNONYM_SET_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"contentwarehouse.googleapis.com\") used by `MakeSynonymSetServiceConnection()`.\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."]]
