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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.
Endpoint OverridesGOOGLE_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_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::LoggingComponentsOption
GOOGLE_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::GrpcTracingOptionsOption
GOOGLE_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_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 outlines various versions of the App Engine C++ library, with version 2.37.0-rc being the latest available release candidate."],["Several environment variables allow for the configuration of the library's behavior, including troubleshooting and overriding default endpoints for different services like Applications, Authorized Certificates, and more."],["The document describes how to enable and modify gRPC tracing through the `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` environment variables."],["Logging in the library can be activated by setting the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` environment variable, which directs the library to output log information."],["It also shows that the `GOOGLE_CLOUD_PROJECT` is used for examples and tests and has no effect on the library."]]],[]]
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