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_HUB_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkconnectivity.googleapis.com") used by MakeHubServiceConnection().
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"]],[["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 2025-03-05 UTC."],[[["The webpage provides documentation for various versions of the C++ Network Connectivity library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Environment variables can be used to configure the library's behavior, especially useful for troubleshooting, such as `GOOGLE_CLOUD_CPP_HUB_SERVICE_ENDPOINT` for endpoint overrides and `GOOGLE_CLOUD_CPP_ENABLE_TRACING` for tracing."],["Logging in the library can be enabled and configured using environment variables like `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to allow the library's logs to be printed to the console, and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` to configure the behavior of gRPC tracing."],["While the `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and tests to configure the GCP project, it has no effect within the library itself."]]],[]]
