public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
    return VmMigrationStubSettings.defaultGrpcApiClientHeaderProviderBuilder();
  }
Returns a builder for the default REST ChannelProvider for this service.
java-vmmigration/google-cloud-vmmigration/src/main/java/com/google/cloud/vmmigration/v1/stub/VmMigrationStubSettings.java