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_APP_HUB_ENDPOINT=... overrides the EndpointOption (which defaults to "apphub.googleapis.com") used by MakeAppHubConnection().
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 AppHub C++ library, ranging from version 2.23.0 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, and can override settings that would normally be configured through code."],["The `GOOGLE_CLOUD_CPP_APP_HUB_ENDPOINT` environment variable can be set to override the default endpoint used by `MakeAppHubConnection()`, which is typically \"apphub.googleapis.com\"."],["Setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` turns on tracing for gRPC calls, allowing you to view gRPC requests and responses, and it is recommended to also enable `GOOGLE_CLOUD_CPP_ENABLE_CLOG` for console output."],["`GOOGLE_CLOUD_PROJECT=...` can be used to set the project in examples and tests, however it will have no effect on the library itself."]]],[]]
