Safari seems not sending If-Modified-Since header for main address

Not sure I'm in the appropriate forum but let's try (if there is more appropriate one please advise).
When Safari requests a resource (page, image...) to a web server it doesn't provide If-Modified-Since header for the main resource of the request. That means the web server can't answer "resource not modified, use your cache". This is not the behavior of other browsers and not good in terms of performance for the web server as well as for the user.
However Safari sends this If-Modified-Since for the sub-elements of the resource (e.g. images, css in a page...). Which is good.
Is there a way to influence Safari's behavior to provide a If-Modified-Since for the main resource requested to the server?
acama,

Found out the answer. IIS 6 does in fact steal "If-Modified-Since" and "If-None-Match" headers, but only on custom 404 redirects. That's actually what I'm doing here (that'll teach me not to put details in a question when I think they're irrelevant -- actually I just forgot).
Here's two discussions on the issue (they're using ASP, but apparently it's the same for ColdFusion):
http://www.eggheadcafe.com/conversation.aspx?messageid=32839787&threadid=32839787
http://www.webmasterworld.com/microsoft_asp_net/3935439.htm

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Hi all,
In looking at past posts, I'm afraid I know the horrible answer
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Let me start by saying I'm using Tomcat v4.0.4 beta 3.
As you know, when a client (usually a web browser) has a cached
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No, you cannot simply do this:
<%!
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%>The problem is that the above method will never be called by the
container.
I traced through some of the Tomcat/Catalina/Jasper code and it
seems to me that the response code is being set to 200/OK very
early on in the processing.
I also took a cursory look at the JSP spec and didn't find any
indication of setting a "Not-Modified" response code...so, I am
thinking this is something that is (strangely) missing in the JSP
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Can anyone confirm this?
Thanks...

I've not come across this before, but like you I cannot find any mention of how to handle modification dates in the JSP spec. I can think of a couple of possible ways round this:
1. Try to delegate the functionality to a servlet. You'd need to pass the JSPs modification date and handle the return. Seems messy and I haven't tried it.
2. Add code to the JSP to read the headers directly and set the appropriate status code. e.g. at start of JSP:
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If-modified-since header?

Google tells me I need to be hosted on a server that supports this header (and it makes sense from a Google perspective). My host tells me that his servers do support that header. Yet when I test my pages on his server, the tool I am using tells me no support. Can anyone here help me with this?

OK - for this to work, you need to insert a preamble on each PHP page -
<?php
$tsstring = gmdate('D, d M Y H:i:s ', $timestamp) . 'GMT';
$etag = $language . $timestamp;
$if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false;
$if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? $_SERVER['HTTP_IF_NONE_MATCH'] : false;
if ((($if_none_match && $if_none_match == $etag) || (!$if_none_match)) &&
($if_modified_since && $if_modified_since == $tsstring))
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exit();
else
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?>
This is from the discussion here -
http://stackoverflow.com/questions/1971721/how-to-use-http-cache-headers-with-php
which I had seen once, but it was not clear to me that this was to be used on the pages involved, and thought it might be a way to check the if-modified-since header from a PHP page instead of a way to make the page send the header.

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Safe Mode
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Safari seems not sending If-Modified-Since header for main address

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