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1. Symptom:

I found lots of requests for the same resource on Apache logs, like this:

/image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 206 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 206 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 206 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120
10.83.140.23 - - [29/Dec/2011:08:50:10 +0800] "GET /image/default/dHtmTreeImg/iconUnCheckAll.gif HTTP/1.1" 200 120

I searched a lot still don't understand why this happens? How to prevent this happens? Thanks.

2. Environment

Apache: 2.2 OS: windows 2003

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2 Answers 2

up vote 0 down vote accepted

Those are requests for an image associated with the dhtmlxTree script (cf.), which you're presumably using somewhere on your site. The response code seems to be 200, so no problem.

What's the confusion?

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I think the problem is he's getting the same request 20 times in a second. –  DisgruntledGoat Dec 31 '11 at 3:50
    
yes, why 20 times in one second! –  huangli Jan 8 '12 at 3:28
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It's not a problem for your web server. It's the client who sends the same request multiple times. Maybe an old IE, or any browser/application that does not use cache.

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