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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."],[[["The latest release candidate version is 2.37.0-rc, and there are also 26 other listed versions available for this App Engine C++ library, ranging from 2.36.0 down to 2.11.0."],["Environment variables allow configuration of the library's behavior and can be useful for troubleshooting, with functions in the code to also allow configuring behavior."],["Endpoint overrides, utilizing `GOOGLE_CLOUD_CPP_*_ENDPOINT` variables, enable customization of the default \"appengine.googleapis.com\" endpoint used by various connection functions."],["Tracing and logging for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, with additional options for tracing behavior customization via `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`."],["`GOOGLE_CLOUD_PROJECT` is an environment variable used for examples and tests to set the GCP project but does not directly affect the library's functionality."]]],[]]
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