public static boolean isChunkUpload(Map<String, Object> args) throws RestServiceException {
    return getBooleanHeader(args, Headers.CHUNK_UPLOAD, false);
  }
Determine if {@link Headers#CHUNK_UPLOAD} is set in the request args.
@param args The request arguments.
@return {@code true} if {@link Headers#CHUNK_UPLOAD} is set.
@throws RestServiceException if exception occurs during parsing the arg.
ambry-api/src/main/java/com/github/ambry/rest/RestUtils.java