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_ACCESS_APPROVAL_ENDPOINT=...overrides theEndpointOption(which defaults to "accessapproval.googleapis.com") used byMakeAccessApprovalConnection().
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 setGOOGLE_CLOUD_CPP_ENABLE_CLOGto 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.
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThis document provides version history and environment variable configurations for the Access Approval C++ library, starting from version 2.12.0 and extending up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_ACCESS_APPROVAL_ENDPOINT\u003c/code\u003e environment variable can override the default endpoint used by \u003ccode\u003eMakeAccessApprovalConnection()\u003c/code\u003e, allowing users to specify a custom endpoint.\u003c/p\u003e\n"],["\u003cp\u003eThe environment variable \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e enables detailed tracing for gRPC calls, allowing developers to monitor and troubleshoot the library's interactions, alongside \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e to display them.\u003c/p\u003e\n"],["\u003cp\u003eThe library supports logging functionalities that can be activated by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e, which enables the library's internal logging to output to the program's console.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be set to configure a GCP project for testing purposes, but it doesn't affect the behaviour of the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.12.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/accessapproval/latest/accessapproval-env)\n- [2.41.0](/cpp/docs/reference/accessapproval/2.41.0/accessapproval-env)\n- [2.40.0](/cpp/docs/reference/accessapproval/2.40.0/accessapproval-env)\n- [2.39.0](/cpp/docs/reference/accessapproval/2.39.0/accessapproval-env)\n- [2.38.0](/cpp/docs/reference/accessapproval/2.38.0/accessapproval-env)\n- [2.37.0](/cpp/docs/reference/accessapproval/2.37.0/accessapproval-env)\n- [2.36.0](/cpp/docs/reference/accessapproval/2.36.0/accessapproval-env)\n- [2.35.0](/cpp/docs/reference/accessapproval/2.35.0/accessapproval-env)\n- [2.34.0](/cpp/docs/reference/accessapproval/2.34.0/accessapproval-env)\n- [2.33.0](/cpp/docs/reference/accessapproval/2.33.0/accessapproval-env)\n- [2.32.0](/cpp/docs/reference/accessapproval/2.32.0/accessapproval-env)\n- [2.31.0](/cpp/docs/reference/accessapproval/2.31.0/accessapproval-env)\n- [2.30.0](/cpp/docs/reference/accessapproval/2.30.0/accessapproval-env)\n- [2.29.0](/cpp/docs/reference/accessapproval/2.29.0/accessapproval-env)\n- [2.28.0](/cpp/docs/reference/accessapproval/2.28.0/accessapproval-env)\n- [2.27.0](/cpp/docs/reference/accessapproval/2.27.0/accessapproval-env)\n- [2.26.0](/cpp/docs/reference/accessapproval/2.26.0/accessapproval-env)\n- [2.25.1](/cpp/docs/reference/accessapproval/2.25.1/accessapproval-env)\n- [2.24.0](/cpp/docs/reference/accessapproval/2.24.0/accessapproval-env)\n- [2.23.0](/cpp/docs/reference/accessapproval/2.23.0/accessapproval-env)\n- [2.22.1](/cpp/docs/reference/accessapproval/2.22.1/accessapproval-env)\n- [2.21.0](/cpp/docs/reference/accessapproval/2.21.0/accessapproval-env)\n- [2.20.0](/cpp/docs/reference/accessapproval/2.20.0/accessapproval-env)\n- [2.19.0](/cpp/docs/reference/accessapproval/2.19.0/accessapproval-env)\n- [2.18.0](/cpp/docs/reference/accessapproval/2.18.0/accessapproval-env)\n- [2.17.0](/cpp/docs/reference/accessapproval/2.17.0/accessapproval-env)\n- [2.16.0](/cpp/docs/reference/accessapproval/2.16.0/accessapproval-env)\n- [2.15.1](/cpp/docs/reference/accessapproval/2.15.1/accessapproval-env)\n- [2.14.0](/cpp/docs/reference/accessapproval/2.14.0/accessapproval-env)\n- [2.13.0](/cpp/docs/reference/accessapproval/2.13.0/accessapproval-env)\n- [2.12.0](/cpp/docs/reference/accessapproval/2.12.0/accessapproval-env)\n- [2.11.0](/cpp/docs/reference/accessapproval/2.11.0/accessapproval-env) \n\nEnvironment Variables\n=====================\n\nA 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.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_ACCESS_APPROVAL_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"accessapproval.googleapis.com\") used by `MakeAccessApprovalConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`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.\n\n###### See Also\n\n[`google::cloud::TracingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1TracingComponentsOption.html)`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.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`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.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library."]]
