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 the EndpointOption (which defaults to "developerconnect.googleapis.com") used by MakeDeveloperConnectConnection().
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-02 UTC."],[[["This page details the environment variables and settings for configuring the behavior of the Developer Connect library, including the endpoint and logging."],["The latest release candidate is version 2.37.0-rc, and a range of previous versions, from 2.36.0 down to 2.27.0, are also documented here."],["You can override the default endpoint of the library using the `GOOGLE_CLOUD_CPP_DEVELOPER_CONNECT_ENDPOINT` environment variable."],["Tracing for gRPC calls can be enabled with `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which also requires enabling console output with `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to view the traces."],["The environment variable `GOOGLE_CLOUD_PROJECT` is used to configure the GCP project in examples and tests, but it has no effect on the library itself."]]],[]]
