An idiomatic C++ client library for the API Gateway API, a service to develop, deploy, secure, and manage APIs with a fully managed gateway.
While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.
Quickstart
The following shows the code that you'll run in the google/cloud/apigateway/quickstart/ directory, which should give you a taste of the API Gateway API C++ client library API.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 webpage details the C++ client library for the API Gateway API, a service for managing APIs on Google Cloud.\u003c/p\u003e\n"],["\u003cp\u003eThe library's latest release is version 2.37.0-rc, though note that Google Cloud C++ client libraries do not adhere to Semantic Versioning.\u003c/p\u003e\n"],["\u003cp\u003eThe primary class is \u003ccode\u003eapigateway_v1::ApiGatewayServiceClient\u003c/code\u003e, through which all RPCs are exposed and can be tested by mocking.\u003c/p\u003e\n"],["\u003cp\u003eThe page provides instructions for error handling, overriding the default endpoint and authentication credentials, as well as manipulating retry policies.\u003c/p\u003e\n"],["\u003cp\u003eThe page shows environment variables that can configure the library's behavior, and also displays a quickstart code sample to get users up to speed.\u003c/p\u003e\n"]]],[],null,["Version latestkeyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/apigateway/latest)\n- [2.41.0](/cpp/docs/reference/apigateway/2.41.0)\n- [2.40.0](/cpp/docs/reference/apigateway/2.40.0)\n- [2.39.0](/cpp/docs/reference/apigateway/2.39.0)\n- [2.38.0](/cpp/docs/reference/apigateway/2.38.0)\n- [2.37.0](/cpp/docs/reference/apigateway/2.37.0)\n- [2.36.0](/cpp/docs/reference/apigateway/2.36.0)\n- [2.35.0](/cpp/docs/reference/apigateway/2.35.0)\n- [2.34.0](/cpp/docs/reference/apigateway/2.34.0)\n- [2.33.0](/cpp/docs/reference/apigateway/2.33.0)\n- [2.32.0](/cpp/docs/reference/apigateway/2.32.0)\n- [2.31.0](/cpp/docs/reference/apigateway/2.31.0)\n- [2.30.0](/cpp/docs/reference/apigateway/2.30.0)\n- [2.29.0](/cpp/docs/reference/apigateway/2.29.0)\n- [2.28.0](/cpp/docs/reference/apigateway/2.28.0)\n- [2.27.0](/cpp/docs/reference/apigateway/2.27.0)\n- [2.26.0](/cpp/docs/reference/apigateway/2.26.0)\n- [2.25.1](/cpp/docs/reference/apigateway/2.25.1)\n- [2.24.0](/cpp/docs/reference/apigateway/2.24.0)\n- [2.23.0](/cpp/docs/reference/apigateway/2.23.0)\n- [2.22.1](/cpp/docs/reference/apigateway/2.22.1)\n- [2.21.0](/cpp/docs/reference/apigateway/2.21.0)\n- [2.20.0](/cpp/docs/reference/apigateway/2.20.0)\n- [2.19.0](/cpp/docs/reference/apigateway/2.19.0)\n- [2.18.0](/cpp/docs/reference/apigateway/2.18.0)\n- [2.17.0](/cpp/docs/reference/apigateway/2.17.0)\n- [2.16.0](/cpp/docs/reference/apigateway/2.16.0)\n- [2.15.1](/cpp/docs/reference/apigateway/2.15.1)\n- [2.14.0](/cpp/docs/reference/apigateway/2.14.0)\n- [2.13.0](/cpp/docs/reference/apigateway/2.13.0)\n- [2.12.0](/cpp/docs/reference/apigateway/2.12.0)\n- [2.11.0](/cpp/docs/reference/apigateway/2.11.0) \n\nAPI Gateway API C++ Client Library\n==================================\n\nAn idiomatic C++ client library for the [API Gateway API](https://cloud.google.com/api-gateway), a service to develop, deploy, secure, and manage APIs with a fully managed gateway.\n\nWhile this library is **GA** , please note Google Cloud C++ client libraries do **not** follow [Semantic Versioning](https://semver.org/).\n\n### Quickstart\n\nThe following shows the code that you'll run in the `google/cloud/apigateway/quickstart/` directory, which should give you a taste of the API Gateway API C++ client library API. \n\n #include \"google/cloud/apigateway/v1/api_gateway_client.h\"\n #include \"google/cloud/location.h\"\n #include \u003ciostream\u003e\n\n int main(int argc, char* argv[]) try {\n if (argc != 3) {\n std::cerr \u003c\u003c \"Usage: \" \u003c\u003c argv[0] \u003c\u003c \" project-id location-id\\n\";\n return 1;\n }\n\n auto const location = google::cloud::Location(argv[1], argv[2]);\n\n namespace apigateway = ::google::cloud::apigateway_v1;\n auto client = apigateway::ApiGatewayServiceClient(\n apigateway::MakeApiGatewayServiceConnection());\n\n for (auto g : client.ListGateways(location.FullName())) {\n if (!g) throw std::move(g).status();\n std::cout \u003c\u003c g-\u003eDebugString() \u003c\u003c \"\\n\";\n }\n\n return 0;\n } catch (google::cloud::Status const& status) {\n std::cerr \u003c\u003c \"google::cloud::Status thrown: \" \u003c\u003c status \u003c\u003c \"\\n\";\n return 1;\n }\n\n### Main classes\n\nThe main class in this library is [`apigateway_v1::ApiGatewayServiceClient`](/cpp/docs/reference/apigateway/latest/classgoogle_1_1cloud_1_1apigateway__v1_1_1ApiGatewayServiceClient). All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock [`apigateway_v1::ApiGatewayServiceClient`](/cpp/docs/reference/apigateway/latest/classgoogle_1_1cloud_1_1apigateway__v1_1_1ApiGatewayServiceClient) when testing your application.\n\n### More Information\n\n- [Error Handling](https://cloud.google.com/cpp/docs/reference/common/latest/common-error-handling.html) - describes how the library reports errors.\n- [How to Override the Default Endpoint](/cpp/docs/reference/apigateway/latest/apigateway-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/apigateway/latest/apigateway-override-authentication) - describes how to change the authentication credentials used by the library.\n- [Override Retry, Backoff, and Idempotency Policies](/cpp/docs/reference/apigateway/latest/apigateway-override-retry) - describes how to change the default retry policies.\n- [Environment Variables](/cpp/docs/reference/apigateway/latest/apigateway-env) - describes environment variables that can configure the behavior of the library."]]