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_CASE_ATTACHMENT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudsupport.googleapis.com") used by MakeCaseAttachmentServiceConnection().
GOOGLE_CLOUD_CPP_CASE_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudsupport.googleapis.com") used by MakeCaseServiceConnection().
GOOGLE_CLOUD_CPP_COMMENT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudsupport.googleapis.com") used by MakeCommentServiceConnection().
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page documents environment variables and configuration options for a C++ library, with the latest version being 2.37.0-rc, and many prior versions listed as well.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can override default settings for service endpoints, such as \u003ccode\u003eGOOGLE_CLOUD_CPP_CASE_SERVICE_ENDPOINT\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_CASE_ATTACHMENT_SERVICE_ENDPOINT\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_COMMENT_SERVICE_ENDPOINT\u003c/code\u003e, which can be used to connect to the Case, Case Attachment, and Comment services.\u003c/p\u003e\n"],["\u003cp\u003eTracing for gRPC calls can be enabled using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e can be used to fine-tune tracing behavior.\u003c/p\u003e\n"],["\u003cp\u003eLogging can be activated by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e, which allows the library to output logs to the program's console.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e is an environment variable that is used in example and integration test but has no direct effect on the library itself.\u003c/p\u003e\n"]]],[],null,[]]
