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Showing content from https://cloud.google.com/cpp/docs/reference/apigateway/2.35.0/apigateway-override-authentication below:

C++ Client Libraries | Google Cloud

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Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:

  [](std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);  // Minimal error handling in examples
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return google::cloud::apigateway_v1::ApiGatewayServiceClient(
        google::cloud::apigateway_v1::MakeApiGatewayServiceConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

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 webpage provides documentation for overriding authentication credentials when using Google Cloud client libraries, specifically for the API Gateway service, with a variety of versions listed."],["The latest available version is 2.37.0-rc, and the documentation spans back to version 2.11.0, detailing the setup for the override."],["By default, client libraries utilize Application Default Credentials for authentication, but users can override this using `UnifiedCredentialsOption`."],["The documentation includes an example demonstrating how to explicitly load a service account key file for authentication."],["The [Best practices for managing service account keys](https://cloud.google.com/iam/docs/best-practices-for-managing-service-account-keys) guide is recommended for further considerations, along with [Authentication Components](https://cloud.google.com/cpp/docs/reference/common/latest/group__guac.html)."]]],[]]

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