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_DOMAINS_ENDPOINT=...overrides theEndpointOption(which defaults to "domains.googleapis.com") used byMakeDomainsConnection().
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::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 2025-09-04 UTC."],[[["\u003cp\u003eThis document provides reference information for the Google Cloud C++ Domains library, with version 2.37.0-rc being the latest and 2.16.0 being the current version.\u003c/p\u003e\n"],["\u003cp\u003eThe document details how to use environment variables to configure the library's behavior, especially for troubleshooting, such as using \u003ccode\u003eGOOGLE_CLOUD_CPP_DOMAINS_ENDPOINT\u003c/code\u003e to override the default endpoint.\u003c/p\u003e\n"],["\u003cp\u003eLogging and tracing functionalities are enabled via \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e, allowing for detailed debugging of gRPC calls and general library operations.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e environment variable modifies the behavior of gRPC tracing, changing how it outputs information.\u003c/p\u003e\n"],["\u003cp\u003eThe document also mentions \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e but notes it only affects examples and integration tests and not the library's functionality.\u003c/p\u003e\n"]]],[],null,["Version 2.16.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/domains/latest/domains-env)\n- [2.41.0](/cpp/docs/reference/domains/2.41.0/domains-env)\n- [2.40.0](/cpp/docs/reference/domains/2.40.0/domains-env)\n- [2.39.0](/cpp/docs/reference/domains/2.39.0/domains-env)\n- [2.38.0](/cpp/docs/reference/domains/2.38.0/domains-env)\n- [2.37.0](/cpp/docs/reference/domains/2.37.0/domains-env)\n- [2.36.0](/cpp/docs/reference/domains/2.36.0/domains-env)\n- [2.35.0](/cpp/docs/reference/domains/2.35.0/domains-env)\n- [2.34.0](/cpp/docs/reference/domains/2.34.0/domains-env)\n- [2.33.0](/cpp/docs/reference/domains/2.33.0/domains-env)\n- [2.32.0](/cpp/docs/reference/domains/2.32.0/domains-env)\n- [2.31.0](/cpp/docs/reference/domains/2.31.0/domains-env)\n- [2.30.0](/cpp/docs/reference/domains/2.30.0/domains-env)\n- [2.29.0](/cpp/docs/reference/domains/2.29.0/domains-env)\n- [2.28.0](/cpp/docs/reference/domains/2.28.0/domains-env)\n- [2.27.0](/cpp/docs/reference/domains/2.27.0/domains-env)\n- [2.26.0](/cpp/docs/reference/domains/2.26.0/domains-env)\n- [2.25.1](/cpp/docs/reference/domains/2.25.1/domains-env)\n- [2.24.0](/cpp/docs/reference/domains/2.24.0/domains-env)\n- [2.23.0](/cpp/docs/reference/domains/2.23.0/domains-env)\n- [2.22.1](/cpp/docs/reference/domains/2.22.1/domains-env)\n- [2.21.0](/cpp/docs/reference/domains/2.21.0/domains-env)\n- [2.20.0](/cpp/docs/reference/domains/2.20.0/domains-env)\n- [2.19.0](/cpp/docs/reference/domains/2.19.0/domains-env)\n- [2.18.0](/cpp/docs/reference/domains/2.18.0/domains-env)\n- [2.17.0](/cpp/docs/reference/domains/2.17.0/domains-env)\n- [2.16.0](/cpp/docs/reference/domains/2.16.0/domains-env)\n- [2.15.1](/cpp/docs/reference/domains/2.15.1/domains-env)\n- [2.14.0](/cpp/docs/reference/domains/2.14.0/domains-env)\n- [2.13.0](/cpp/docs/reference/domains/2.13.0/domains-env)\n- [2.12.0](/cpp/docs/reference/domains/2.12.0/domains-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_DOMAINS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"domains.googleapis.com\") used by `MakeDomainsConnection()`.\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::TracingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1TracingComponentsOption.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."]]
