request a image but nginx return 200 and a blank response header

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http://serverfault.com – When browser(Windows IE8,9 and Windows Chrome(20) and Mac Chrome(20)) request a set of images, some image requests return 304 and display correctly, but others return 200OK and a blank response header, it will display a random image from page. Request URL: http://example.com/statics/images/b_9215b819d9fc2500feb1ec8e12d41f98.jpg Request Method: GET Status Code: 200 OK Request Headersview source Accept: */* Accept-Charset: GBK,utf-8;q=0.7,*;q=0.3 Accept-Encoding: gzip,deflate,sdch Accept-Language: zh-CN,zh;q=0.8 Connection: keep-alive Cookie: remember_user_token=BAhbB1sGaQLoHkkiIiQyYSQ (HowTos)