public Builder clearAuthentication() {
        authenticationCase_ = 0;
        authentication_ = null;
        onChanged();
        return this;
      }
<pre>
Scan authentication configuration.
</pre>

Protobuf type {@code google.cloud.websecurityscanner.v1alpha.ScanConfig.Authentication}
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1alpha/src/main/java/com/google/cloud/websecurityscanner/v1alpha/ScanConfig.java