Re: HTTP Compression issues with IIS 5

From: Tony Cooke (TCooke_at_elders.com.au)
Date: 09/24/04 

Date: Fri, 24 Sep 2004 15:01:02 +0930

Hi again WehJun.

Thanks for your response.

This is a good thing as content that we change infrequently we wouldn't want to resend.

Since we have SP4 on the W2K box we shouldn't have to worry about the "307633 IIS Does Not Return an HTTP 304 Not Modified Message for Compressed" issue.

I have added css and js extensions to the static content behorehand using the adsutil script.

I gather you haven't had much of a chance to look at the files I sent you?

I thank you again for taking the time out to look at them.

All the best,

Tony

""WenJun Zhang[msft]"" <v-wzhang@online.microsoft.com> wrote in message news:9xsEYzVoEHA.404@cpmsftngxa06.phx.gbl...
> Hi Tony,
>
> "Won't this expire all content on the client immediately including
> images, javascript files, etc? This could defeat the purpose of
> having compressed content if we have to resend everything every time."
>
> Sorry I forgot this question. You needn't worry about this. I did
> test and see IIS still would send 304(not modified) response to
> clients when using HTTP compression. 304 response doesn't have any
> actual data, it simply tells client the local cache still can be used
> and hasn't been expired. IIS will reply 304 if client attach a last
> modified time of its local cache in http request and the time isn't
> earlier than the file's on server.
>
> Formerly IIS5 did have a bug on this behavior but it has been fixed
> in service pack 3: 307633 IIS Does Not Return an HTTP 304 Not
> Modified Message for Compressed
> http://support.microsoft.com/?id=307633
>
> I previously suggest you select 'expire immediately' to see if this
> can help resolve the ASP caching problem. Since the problem is worked
> out by max-age=0, now you can rollback it or use the content
> expiration options(in HTTP Headers tab) to control the web client
> cache behavior, the setting can be set at each individual file level.
>
> Furthermore, actually css and js are not compressed file types by
> default. The default ones are only: html/htm and txt. You can
> manually add them to HcFileExtensions by using MetaEdit:
>
> HOW TO: Specify Additional Document Types for HTTP Compression
> http://support.microsoft.com/default.aspx?scid=kb;en-us;234497
>
> Best regards,
>
> WenJun Zhang
> Microsoft Online Support
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
> Get Secure! - www.microsoft.com/security
>

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