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Showing content from https://cloud.google.com/cpp/docs/reference/appengine/2.21.0/appengine-env below:

C++ Client Libraries | Google Cloud

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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.

• GOOGLE_CLOUD_CPP_APPLICATIONS_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeApplicationsConnection().
• GOOGLE_CLOUD_CPP_AUTHORIZED_CERTIFICATES_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeAuthorizedCertificatesConnection().
• GOOGLE_CLOUD_CPP_AUTHORIZED_DOMAINS_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeAuthorizedDomainsConnection().
• GOOGLE_CLOUD_CPP_DOMAIN_MAPPINGS_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeDomainMappingsConnection().
• GOOGLE_CLOUD_CPP_FIREWALL_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeFirewallConnection().
• GOOGLE_CLOUD_CPP_INSTANCES_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeInstancesConnection().
• GOOGLE_CLOUD_CPP_SERVICES_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeServicesConnection().
• GOOGLE_CLOUD_CPP_VERSIONS_ENDPOINT=... overrides the EndpointOption (which defaults to "appengine.googleapis.com") used by MakeVersionsConnection().

google::cloud::EndpointOption

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.

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.

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.

google::cloud::LogBackend

google::cloud::LogSink

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 page provides documentation for various versions of the App Engine C++ client library, with version 2.37.0-rc as the latest release candidate and 2.21.0 being the current main version listed."],["Environment variables can be used to configure the library's behavior, particularly useful for troubleshooting and adjusting settings like endpoint overrides."],["Endpoint overrides can be set for specific functionalities such as Applications, Authorized Certificates, and Firewall via dedicated variables like `GOOGLE_CLOUD_CPP_APPLICATIONS_ENDPOINT`."],["Tracing of gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and detailed tracing behavior can be further customized using `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["Logging in the library can be turned on by setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, which allows the library to output log information to the console."]]],[]]

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