[squid-users] HIT and MISS on same URL

Hi,

When checking log file, I found that my squid returned MISS and then
HIT again same URL (same file) and there are two file_sizes of for the
URL (file). One file_size always get HIT and the other always MISS.

Eg:
118.71.131.240 - - [05/Apr/2013:02:05:30 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1795 "http://mysite.com/vn/index.html" "Mozilla/5.0 (Windows NT 6.1;
WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.43
Safari/537.31" TCP_MISS:NONE
101.99.8.244 - - [05/Apr/2013:02:05:34 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1795 "http://res.mysite.com/vnn2013/css/stylev104.css" "Mozilla/5.0
(Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0" TCP_MISS:NONE
75.37.35.197 - - [05/Apr/2013:02:05:34 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1805 "http://mysite.com/vn/index.html" "Mozilla/4.0 (compatible; MSIE
7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0;
.NET CLR 3.5.30729; .NET CLR 3.0.30618; .NET4.0C)" TCP_MEM_HIT:NONE
192.249.41.3 - - [05/Apr/2013:02:05:35 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1805 "http://mysite.com/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows
NT 6.1; WOW64; Trident/4.0; GTB7.4; SLCC2; .NET CLR 2.0.50727; .NET
CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET CLR
1.1.4322; .NET4.0C; .NET4.0E; InfoPath.3)" TCP_MEM_HIT:NONE
113.166.8.236 - - [05/Apr/2013:02:05:35 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1795 "http://mysite.com/" "Mozilla/5.0 (Windows NT 5.1)
AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.43
Safari/537.31" TCP_MISS:NONE
118.71.35.223 - - [05/Apr/2013:02:05:35 +0700] "GET
http://res.mysite.com/vnn2013/images/icon-mobile.png HTTP/1.0" 200
1795 "http://mysite.com/" "Mozilla/5.0 (Windows NT 6.0; WOW64)
AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.43
Safari/537.31" TCP_MISS:NONE

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Best Regards,
Trung Kiên.