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Cached Images and Bandwidth

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Forum Name: General Discussion
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URL: https://forums.webwiz.net/forum_posts.asp?TID=22125
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Topic: Cached Images and Bandwidth
Posted By: ctscott
Subject: Cached Images and Bandwidth
Date Posted: 05 December 2006 at 2:32pm

Does anyone know if an image that is cached in a browser is still sent by the Server to the browser or is bandwidth preserved by not requesting the image from the server?  If that makes any sense.



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Replies:
Posted By: Mikey
Date Posted: 05 December 2006 at 2:40pm
I've always assumed that the browser checks to see if there is a cached version of the image first and if there is it uses that, thus saving time and bandwidth

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Posted By: Gullanian
Date Posted: 06 December 2006 at 12:54am
Yup.  All images on pages are external to each page, so the browser looks for a cache of each one and doesn't bother requesting it if it has one unless of course it meets some sort of criteria such as "old enough to look again".


Posted By: ctscott
Date Posted: 06 December 2006 at 3:01pm
do you think any of the following would change it to re-pull from the server?
 
Response.ExpiresAbsolute = Now() - 2
Response.AddHeader "pragma","no-cache"
Response.AddHeader "cache-control","private"
Response.CacheControl = "private"
 
 
say no because i like your answer.  Big%20smile


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Posted By: scottage
Date Posted: 09 January 2007 at 4:02pm
Adding response expires, etc. will only affect HTML caching, Images are loaded as an external resource so the browser will look in its local cache, if it isn't there it will request it from the source. If you're have a real issue then look at a caching server or caching service

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