public static void addDefaultHeader(String key, String value) {
		if (isNotBlank(key) && isNotBlank(value)) {
			if (defaultHeader == null) {
				defaultHeader = new HashMap<String, String>();
			}
			defaultHeader.put(key, value);
		}
	}
public static void addDefaultHeader ( String key , String value ) { if ( isNotBlank ( key ) && isNotBlank ( value ) ) { if ( defaultHeader == null ) { defaultHeader = new HashMap < String , String > ( ) ; } defaultHeader . put ( key , value ) ; } }
Added default headers will always be send, can still be overriden using the builder.