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_API_GATEWAY_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "apigateway.googleapis.com") used by MakeApiGatewayServiceConnection().
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."],[[["This document provides environment variable configurations and version-specific documentation links for the C++ API Gateway library."],["The latest release candidate is version 2.37.0-rc, and the document provides a list of versions ranging from 2.37.0-rc down to 2.11.0."],["Environment variables can be used to modify library behavior, including endpoint overrides using `GOOGLE_CLOUD_CPP_API_GATEWAY_SERVICE_ENDPOINT` and enabling tracing with `GOOGLE_CLOUD_CPP_ENABLE_TRACING`."],["Logging can be enabled via the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variable, which will allow for the logging to be displayed in the console."],["`GOOGLE_CLOUD_PROJECT` can be set, but this variable is only used in examples and integration tests and will have no effect on the library itself."]]],[]]
