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::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 2025-03-21 UTC."],[[["This document provides version-specific environment variable configurations and settings for the C++ API Gateway library, covering versions from 2.11.0 up to 2.37.0-rc."],["Environment variables like `GOOGLE_CLOUD_CPP_API_GATEWAY_SERVICE_ENDPOINT` can be used to override the default endpoint used by `MakeApiGatewayServiceConnection()`, which is typically \"apigateway.googleapis.com\"."],["The `GOOGLE_CLOUD_CPP_ENABLE_TRACING` environment variable enables detailed tracing for gRPC calls, and the `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` can be used to customize the format and content of the trace output."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG` activates the logging infrastructure, allowing the library to output log messages to the program's console when this is set to yes."],["`GOOGLE_CLOUD_PROJECT` is used to configure the project in the examples and testing but has no effect within the library itself."]]],[]]
