I'm making some progress, if I include the following:
<?php
$last_modified = filemtime("test.txt");
header("Last-Modified: " . $last_modified);
?>
I get a response header with:
Last-Modified 1229624249
If I then wait a bit and make a change to cause test.txt to be
updated, I get:
Last-Modified 1229627412
So I'm definitely getting the Last-Modified header sent but all the
responses still show up as 200. I should be getting 304s until
test.txt is updated, then get one 200, then more 304s until test.txt
is update again, right?
On Dec 18, 11:05 am, Mike Alsup <mal...@gmail.com> wrote:
> > I take it back, my livedata_fetch.php is coming back with a 200
> > status, but I want it coming back with a 304 not modified, right?
> > That means it'll only fetch the file if it's been updated since the
> > last time it was fetched?
>
> Right. The server needs to set the Last-Modified header for this to
> work correctly. If it does, jQuery will use that date/time in the If-
> Modified-Since header. If the resource has not been modified then the
> server should return an empty response body with a 304 status.
