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Re: If-Modified-Since No Longer Cool?

From: Ari Luotonen <luotonen@netscape.com>
Date: Mon, 7 Oct 1996 17:23:44 -0700 (PDT)
Message-Id: <199610080023.RAA22507@step.mcom.com>
To: jjames@firstfloor.COM (John W. James)
Cc: www-talk@w3.org (www-talk mailing list)

Use the time string given by the Last-modified date.  The comparison
is (as per the HTTP spec) an equality-check, not a less-than-or-equal.

-- Cheers, Ari --

> At 02:31 PM 10/7/96 -0700, you wrote:
> >
> >> I actually tried the four digit year hooked up to a Netscape Enterprise
> >> Server and didn't have any luck either. I should have mentioned all the
> >> formats I tried. I tried using both the long and short form of the day
> >> string (Mon and Monday), both the long and short form of the year (96 and
> >> 1996), tried using both dashes and spaces between the date fields (07-Oct-96
> >> and 07 Oct 96), 
> >> and might have tried a couple of other things I can no longer remember.
> >
> >In the case of Netscape, this is probably due to our DNS load
> >balancing, and the filesystem times not being synchronized.  Try with
> >a fixed homeNN.netscape.com number, where NN is 1..32.
> >
> >-- Cheers, Ari --
> >
> >> {homeplate 51} telnet splendid-splinter 4040
> >> Trying 198.206.195.12 ...
> >> Connected to splendid-splinter.
> >> Escape character is '^]'.
> >> HEAD / HTTP/1.0
> >>  
> >> HTTP/1.0 200 OK
> >> Server: Netscape-Enterprise/2.0a
> >> Date: Mon, 07 Oct 1996 21:06:37 GMT
> >> Accept-ranges: bytes
> >> Last-modified: Thu, 29 Aug 1996 19:05:16 GMT
> >> Content-length: 2863
> >> Content-type: text/html
> >>  
> >> Connection closed by foreign host.
> >> 
> >> {homeplate 51} telnet splendid-splinter 4040
> >> Trying 198.206.195.12 ...
> >> Connected to splendid-splinter.
> >> Escape character is '^]'.
> >> GET / HTTP/1.0
> >> If-Modified-Since: Monday, 07 Oct 1996 16:00:00 GMT
> >>  
> >> HTTP/1.0 200 OK
> >> Server: Netscape-Enterprise/2.0a
> >> Date: Mon, 07 Oct 1996 21:08:22 GMT
> >> Accept-ranges: bytes
> >> Last-modified: Thu, 29 Aug 1996 19:05:16 GMT
> >> Content-length: 2863
> >> Content-type: text/html
> >>  
> >> <HTML>
> >>  
> >> <HEAD>
> >>   <TITLE>Enterprise Home Page</TITLE>
> >> </HEAD>
> >>  
> >> ... etc etc etc ...
> >> 
> >> 
> >> At 01:39 PM 10/7/96 -0700, Ari Luotonen wrote:
> >> >
> >> >> Are there good reasons I just can't think of for not supporting
> >> >> If-modified-since in the request? Did I take a nap and miss a format
> change?
> >> >> 
> >> >> GET / HTTP/1.0
> >> >> If-Modified-Since: Monday, 07-Oct-96 16:00:00 GMT
> >> >
> >> >That's one of the older formats.  The best thing to use is the
> >> >preferred format with full 4-digit year, that is:
> >> >
> >> >If-Modified-Since: Mon, 07 Oct 1996 16:00:00 GMT
> >> >
> >> >or use blindly the same string as is sent by the server in the Date:
> >> >header.
> >> >
> >> >Cheers,
> >> >--
> >> >Ari Luotonen	* * * Opinions my own, not Netscape's * * *
> >> >Netscape Communications Corp.		ari@netscape.com
> >> >501 East Middlefield Road		http://home.netscape.com/people/ari/
> >> >Mountain View, CA 94043, USA		Netscape Proxy Server Development
> >> >
> >> >
> >> 
> >> ---------------------------------------------------------------
> >> John James                    Email:  jjames@firstfloor.COM
> >> First Floor, Inc.             Web:    http://www.firstfloor.COM
> >> 444 Castro Street, Suite 200  Tel:    (415) 254-5101
> >> Mountain View. CA 94041       Fax:    (415) 968-1193
> >> 
> >> 
> >> 
> >> 
> >
> >Cheers,
> >--
> >Ari Luotonen	* * * Opinions my own, not Netscape's * * *
> >Netscape Communications Corp.		ari@netscape.com
> >501 East Middlefield Road		http://home.netscape.com/people/ari/
> >Mountain View, CA 94043, USA		Netscape Proxy Server Development
> >
> >
> 
> ---------------------------------------------------------------
> John James                    Email:  jjames@firstfloor.COM
> First Floor, Inc.             Web:    http://www.firstfloor.COM
> 444 Castro Street, Suite 200  Tel:    (415) 254-5101
> Mountain View. CA 94041       Fax:    (415) 968-1193
> 
> 
> 
> 

Cheers,
--
Ari Luotonen	* * * Opinions my own, not Netscape's * * *
Netscape Communications Corp.		ari@netscape.com
501 East Middlefield Road		http://home.netscape.com/people/ari/
Mountain View, CA 94043, USA		Netscape Proxy Server Development
Received on Monday, 7 October 1996 20:23:56 GMT

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