今年11月12日是中国首位歼-10女飞行员余旭烈士牺牲7周年的忌日。11日正是人民空军成立74周年纪念日，众多网友在庆祝人民空军生日的同时，纷纷发文悼念余旭等长眠蓝天的空军烈士。
Could you explain me? Because in stats I can find Refelar links and I am curious. How are they made? Is it placed somewher开发者_开发知识库e in HTTP request?Yes, it\'s available by the referer header.
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