Caching Made Simple - A Practical Birdseye Overview
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by Michael Libby
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How to Cache Images without Roundtrip Modification Checking

Instant Image Redisplay!

Let’s assume that your site is filled with graphics which constantly require server-side modification checking. After assessing your site, you decide that over 80 percent of your images have not changed in months and modifications no longer need to be checked with each web page request. You predict that eliminating modification checks will greatly improve web page performance.

STEP BY STEP:

1.      Create a directory under your web application named ImagesCached.

2.      Open IIS (Internet Information Server).

3.      Browse to your web application's virtual directory.

4.      Right-click on the ImagesCached directory and select Properties from the context menu.

5.      From the Properties dialog select the HTTP Headers tab.

6.      Check Enable Content Expiration and select Expire after 1 day and press OK.

7.      Copy your images to the ImagesCached directory and change all corresponding HTML references.

Many web host providers will provide directory caching if you explain the above steps.

 


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User Comments

Title: Good one though problem with firefox   
Name: dotnetguts
Date: 2009-05-03 9:09:10 AM
Comment:
Thanks for good article, I have tried instruction mentioned in article, but it is still not working for firefox, any idea? to make it work.

DotNetGuts
http://dotnetguts.blogspot.com
Title: good one   
Name: vijay chand
Date: 2009-02-09 4:15:13 AM
Comment:
The above article has given me some knowledgeable thing
Title: REg. getting URLs of all visited Sites   
Name: Ad
Date: 2007-08-13 9:24:34 AM
Comment:
Hi

In the txt file, I only get the URL of this website, nothing more. Could you let me know what I m missing.
This is what I get -- 127.0.0.1;/CachingMadeSimple/OutputCachingClient.aspx;8/13/2007 6:46:57 PM

Also, could u explain the 2 minute time limit u hv put?
regards
Ad
Title: Software Enginner   
Name: Chintan Mehta
Date: 2007-07-02 9:55:09 AM
Comment:
This tutorial is very good but i want tutorial which describe actual in which scenario we have to use which type of caching. say in which condition fragment caching is usefull, in which condition data caching is usefull please describe with example if it is possible.

Thankyou.
Title: Software Engineer   
Name: Mudassar
Date: 2006-08-10 5:12:29 PM
Comment:
Excellent
Title: Great Article   
Name: Susan Dawson (Israel)
Date: 2006-04-08 9:17:06 PM
Comment:
This is one of many great articles you've written. I enjoy your easy to follow step by step articles. You are on my must read list.

Susan.
Title: Re: Images without roundtrip   
Name: Michael Libby
Date: 2006-01-31 10:12:32 AM
Comment:
Hi Fabio,
Regarding, "Copy your images to the ImagesCached directory and change all corresponding HTML references". This means that if your image directory changed then you must also change the source for your HTML Image Tag. For example, change the HTML IMG tag's src from src='NonCachedImgDir/MyImg.jpg' to src='CacheImgDir/MyImg.jpg'.
Title: images without roundtrip   
Name: Fabio Rauh
Date: 2006-01-31 7:21:57 AM
Comment:
Hi, I read your article and I´ve a doubt about how to cache images without roundtrip modification checking
I did not understand the step 7, what u mean "change" all corresponding html references. What do I have to do?
Thank you

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