public static ApiClientHeaderProvider.Builder defaultHttpJsonApiClientHeaderProviderBuilder() {
    return ApiClientHeaderProvider.newBuilder()
        .setGeneratedLibToken(
            "gapic", GaxProperties.getLibraryVersion(ImageAnnotatorStubSettings.class))
        .setTransportToken(
            GaxHttpJsonProperties.getHttpJsonTokenName(),
            GaxHttpJsonProperties.getHttpJsonVersion());
  }
Returns a builder for the default REST ChannelProvider for this service.
java-vision/google-cloud-vision/src/main/java/com/google/cloud/vision/v1p3beta1/stub/ImageAnnotatorStubSettings.java