public static ApiClientHeaderProvider.Builder defaultHttpJsonApiClientHeaderProviderBuilder() {
    return ApiClientHeaderProvider.newBuilder()
        .setGeneratedLibToken("gapic", GaxProperties.getLibraryVersion(TpuStubSettings.class))
        .setTransportToken(
            GaxHttpJsonProperties.getHttpJsonTokenName(),
            GaxHttpJsonProperties.getHttpJsonVersion());
  }
Returns a builder for the default REST ChannelProvider for this service.
java-tpu/google-cloud-tpu/src/main/java/com/google/cloud/tpu/v2/stub/TpuStubSettings.java