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::websecurityscanner_v1::WebSecurityScannerClient(
google::cloud::websecurityscanner_v1::MakeWebSecurityScannerConnection(
options));
}
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 provides a list of versioned documentation for the Web Security Scanner, ranging from version 2.37.0-rc (latest) down to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eIt also includes instructions on how to override the default authentication credentials, which use Application Default Credentials, when interacting with Google Cloud services.\u003c/p\u003e\n"],["\u003cp\u003eThe override process involves providing a UnifiedCredentialsOption and is illustrated with an example of loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe guide references the "Best practices for managing service account keys" for further instructions, as well as a link to the Authentication Components documentation.\u003c/p\u003e\n"]]],[],null,[]]
