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_API_KEYS_ENDPOINT=... overrides the EndpointOption (which defaults to "apikeys.googleapis.com") used by MakeApiKeysConnection().
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"]],[["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 2025-04-01 UTC."],[[["This document provides environment variable configurations and version history for the Google Cloud C++ API Keys library, specifically focusing on versions ranging from 2.11.0 to 2.37.0-rc."],["The `GOOGLE_CLOUD_CPP_API_KEYS_ENDPOINT` environment variable can be used to override the default endpoint for `MakeApiKeysConnection()`, allowing customization of the API endpoint."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and it requires setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG` for console output, alongside enabling logging in the library."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows you to modify gRPC tracing, such as adjusting the format of the output, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` turns on the logging infrastructure for the library to be able to output the logs to the console."],["The `GOOGLE_CLOUD_PROJECT` allows setting the project used in examples and integration tests."]]],[]]
