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_CLOUD_FUNCTIONS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudfunctions.googleapis.com") used by MakeCloudFunctionsServiceConnection().
GOOGLE_CLOUD_CPP_FUNCTION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudfunctions.googleapis.com") used by MakeFunctionServiceConnection().
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::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"]],[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 C++ library functions.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to adjust the library's behavior, with the variables being particularly useful for troubleshooting and configuration purposes.\u003c/p\u003e\n"],["\u003cp\u003eSpecific environment variables such as \u003ccode\u003eGOOGLE_CLOUD_CPP_CLOUD_FUNCTIONS_SERVICE_ENDPOINT\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_FUNCTION_SERVICE_ENDPOINT\u003c/code\u003e allow users to override default endpoint settings.\u003c/p\u003e\n"],["\u003cp\u003eTracing and logging can be enabled and customized using variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e to monitor gRPC calls and library operations.\u003c/p\u003e\n"],["\u003cp\u003eWhile \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can set the default GCP project in examples and tests, it does not have any impact on the functionality of the library.\u003c/p\u003e\n"]]],[],null,[]]
