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_IDS_ENDPOINT=... overrides the EndpointOption (which defaults to "ids.googleapis.com") used by MakeIDSConnection().
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis document provides a comprehensive list of available versions, ranging from 2.11.0 up to the latest release candidate 2.37.0-rc, for the Google Cloud C++ client library's ID service.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to modify the behavior of the library, including troubleshooting issues, with functions available in the code to configure these as well.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_IDS_ENDPOINT\u003c/code\u003e variable can override the default endpoint used by \u003ccode\u003eMakeIDSConnection()\u003c/code\u003e, which is "ids.googleapis.com".\u003c/p\u003e\n"],["\u003cp\u003eTracing for gRPC calls can be activated using the \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e variable, and additional control over this behavior can be achieved with the \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e variable.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e variable can enable logging within the library, which outputs to the console when set, and \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be used in example or integration tests, but has no direct effect on the library itself.\u003c/p\u003e\n"]]],[],null,[]]
