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 2025-03-14 UTC."],[[["The page provides documentation for various versions of the Network Connectivity C++ library, ranging from version 2.11.0 up to the release candidate 2.37.0-rc, with the most current stable being 2.23.0."],["Environment variables are crucial for configuring the library's behavior and are particularly useful for troubleshooting, with specific variables available for overriding endpoints, enabling tracing, and controlling logging output."],["`GOOGLE_CLOUD_CPP_HUB_SERVICE_ENDPOINT` allows users to override the default endpoint, `GOOGLE_CLOUD_CPP_ENABLE_TRACING` activates tracing for gRPC calls, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` turns on logging in the library."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows for the modification of gRPC tracing behavior, influencing factors like output formatting and field truncation, and `GOOGLE_CLOUD_PROJECT` is used in examples and integration tests for project configuration."]]],[]]
