config/src/main/java/org/springframework/security/config/annotation/web/configurers/HeadersConfigurer.java
private HeaderWriterFilter createHeaderWriterFilter() {
		List<HeaderWriter> writers = getHeaderWriters();
		if (writers.isEmpty()) {
			throw new IllegalStateException(
					"Headers security is enabled, but no headers will be added. Either add headers or disable headers security");
		}
		HeaderWriterFilter headersFilter = new HeaderWriterFilter(writers);
		headersFilter = postProcess(headersFilter);
		return headersFilter;
	}
private HeaderWriterFilter createHeaderWriterFilter() {
		List<HeaderWriter> writers = getHeaderWriters();
		if (writers.isEmpty()) {
			throw new IllegalStateException(
					"Headers security is enabled, but no headers will be added. Either add headers or disable headers security");
		}
		HeaderWriterFilter headersFilter = new HeaderWriterFilter(writers);
		headersFilter = postProcess(headersFilter);
		return headersFilter;
	}
private HeaderWriterFilter createHeaderWriterFilter ( ) { List < HeaderWriter > writers = getHeaderWriters ( ) ; if ( writers . isEmpty ( ) ) { throw new IllegalStateException ( "Headers security is enabled, but no headers will be added. Either add headers or disable headers security" ) ; } HeaderWriterFilter headersFilter = new HeaderWriterFilter ( writers ) ; headersFilter = postProcess ( headersFilter ) ; return headersFilter ; }
Creates the {@link HeaderWriter}

@return the {@link HeaderWriter}
Creates the { @link HeaderWriter }