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_DEVELOPER_CONNECT_ENDPOINT=...overrides theEndpointOption(which defaults to "developerconnect.googleapis.com") used byMakeDeveloperConnectConnection().
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 webpage documents environment variables and settings for configuring the behavior of the Developer Connect C++ library, focusing on versions 2.27.0 through 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can override default configurations, such as \u003ccode\u003eGOOGLE_CLOUD_CPP_DEVELOPER_CONNECT_ENDPOINT\u003c/code\u003e which allows for custom endpoint specifications.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e variables control gRPC tracing, enabling detailed request/response logging, while \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e enables logging to the console.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e variable configures the GCP project for examples and tests but does not impact the library's functionality.\u003c/p\u003e\n"],["\u003cp\u003eThere are various older versions of the library available for access, listed from version 2.27.0 all the way to the most recent release candidate version 2.37.0-rc.\u003c/p\u003e\n"]]],[],null,["Version 2.33.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/developerconnect/latest/developerconnect-env)\n- [2.41.0](/cpp/docs/reference/developerconnect/2.41.0/developerconnect-env)\n- [2.40.0](/cpp/docs/reference/developerconnect/2.40.0/developerconnect-env)\n- [2.39.0](/cpp/docs/reference/developerconnect/2.39.0/developerconnect-env)\n- [2.38.0](/cpp/docs/reference/developerconnect/2.38.0/developerconnect-env)\n- [2.37.0](/cpp/docs/reference/developerconnect/2.37.0/developerconnect-env)\n- [2.36.0](/cpp/docs/reference/developerconnect/2.36.0/developerconnect-env)\n- [2.35.0](/cpp/docs/reference/developerconnect/2.35.0/developerconnect-env)\n- [2.34.0](/cpp/docs/reference/developerconnect/2.34.0/developerconnect-env)\n- [2.33.0](/cpp/docs/reference/developerconnect/2.33.0/developerconnect-env)\n- [2.32.0](/cpp/docs/reference/developerconnect/2.32.0/developerconnect-env)\n- [2.31.0](/cpp/docs/reference/developerconnect/2.31.0/developerconnect-env)\n- [2.30.0](/cpp/docs/reference/developerconnect/2.30.0/developerconnect-env)\n- [2.29.0](/cpp/docs/reference/developerconnect/2.29.0/developerconnect-env)\n- [2.28.0](/cpp/docs/reference/developerconnect/2.28.0/developerconnect-env)\n- [2.27.0](/cpp/docs/reference/developerconnect/2.27.0/developerconnect-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_DEVELOPER_CONNECT_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"developerconnect.googleapis.com\") used by `MakeDeveloperConnectConnection()`.\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."]]
