lib/server-core/src/main/java/org/apache/olingo/server/core/batchhandler/BatchHandler.java [64:74]:
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  private void validatePreferHeader(final ODataRequest request) throws ODataHandlerException {
    final List<String> returnPreference = request.getHeaders(HttpHeader.PREFER);
    if (null != returnPreference) {
      for (String preference : returnPreference) {
        if (preference.equals(RETURN_MINIMAL) || preference.equals(RETURN_REPRESENTATION)) {
          throw new ODataHandlerException("Prefer Header not supported: " + preference,
              ODataHandlerException.MessageKeys.INVALID_PREFER_HEADER, preference);
        } 
      }
    }
  }
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lib/server-core/src/main/java/org/apache/olingo/server/core/ODataDispatcher.java [591:601]:
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  private void validatePreferHeader(final ODataRequest request) throws ODataHandlerException {
    final List<String> returnPreference = request.getHeaders(HttpHeader.PREFER);
    if (null != returnPreference) {
      for (String preference : returnPreference) {
        if (preference.equals(RETURN_MINIMAL) || preference.equals(RETURN_REPRESENTATION)) {
          throw new ODataHandlerException("Prefer Header not supported: " + preference,
              ODataHandlerException.MessageKeys.INVALID_PREFER_HEADER, preference);
        } 
      }
    }
  }
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