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Showing content from https://cloud.google.com/cpp/docs/reference/appengine/2.15.1/appengine-env below:

C++ Client Libraries | Google Cloud

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Environment Variables

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 See Also

google::cloud::EndpointOption

Logging

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.

See Also

google::cloud::LogBackend

See Also

google::cloud::LogSink

Setting the Default Project

GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["This document provides reference information for various versions of the C++ App Engine environment, with the latest release candidate being version 2.37.0-rc."],["Environment variables can be used to override the default endpoints for different App Engine services, such as Applications, Authorized Certificates, and more, and these variables start with the `GOOGLE_CLOUD_CPP_` prefix."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which will log each request and response, and to produce any output on the program's console, `GOOGLE_CLOUD_CPP_ENABLE_CLOG` should be set as well."],["The behavior of gRPC tracing can be modified using the `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variable, allowing for customization of output format and field truncation."],["The `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` environment variable turns on the logging within the library, allowing for library logs to be visible through the use of a logging backend."]]],[]]


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