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_POLICY_BASED_ROUTING_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkconnectivity.googleapis.com") used by MakePolicyBasedRoutingServiceConnection().
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 2025-03-05 UTC."],[[["The webpage provides documentation for various versions of the Network Connectivity C++ library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Environment variables can be set to configure the library's behavior, including `GOOGLE_CLOUD_CPP_HUB_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_POLICY_BASED_ROUTING_SERVICE_ENDPOINT` for endpoint overrides."],["Tracing and logging of gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, respectively, to aid in troubleshooting."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows customization of gRPC tracing output, such as controlling message formatting and field truncation."],["The default GCP project can be configured with the `GOOGLE_CLOUD_PROJECT` variable, although it only has effect in examples and integration tests, not the library itself."]]],[]]
