Posted by "Jared Williams" on 10/03/61 11:16

> -----Original Message-----
> From: Bill Hoffman [mailto:xbhoff@mac.com]
> Sent: 19 May 2005 00:46
> To: php-general@lists.php.net
> Subject: Re: [PHP] libxml_set_streams_context
>
>
> On May 18, 2005, at 4:10 PM, Jared Williams wrote:
>
> > Sure the server is checking if modified since headers?
>
> I'm capturing the response headers from the remote server, so
> I can see that.
>
> > Just tried a bit of code here and it seems to be working as
> expected
> > (5.0.4 Win32)
>
> 1) I made an initial mistake by running my PHP script(s) from
> the command line and not from a server.
> 2) but now when running my PHP script(s) from a server I see that:
>
> file_get_contents() with a conditional get in a stream
> context works as expected; that is, the remote server returns
> a 304 not modified HTTP response header only. (if doing this
> with file_get_contents(), then the
> libxml_set_streams_context() function call is of course irrelevant).
>
> DOMDocument::load() with a conditional get in a stream
> context set via libxml_set_streams_context() shows odd
> results; that is, the remote server returns a 304 not
> modified in the HTTP response header, but also returns the
> file contents as well (!!??).
>
> That's a bit baffling -- a server shouldn't do that, since
> the 304 response header ends with "connection: close", so I
> don't know how or why the file contents are being captured
> too. I would think a 304 response header means that the
> request header was properly interpreted and nothing but a
> header would be returned. Hard to know if the problem is on
> my end or on the remote server side. I note also that stream
> contexts send only as HTTP/1.0, and the remote server is
> returning HTTP/1.1, and I just don't know if that's a
> possible factor in this or not.

Warning: DOMDocument::load(http://localhost/test.php) [function.load]: failed to open stream: HTTP request failed! HTTP/1.1 304
Undescribed in C:\Inetpub\evildocs\www\load.php on line 12
<?xml version="1.0"?> <refentry id="function.mcal-next-recurrence"> <refnamediv> <refname>mcal_next_recurrence</refname>
<refpurpose>Returns the next recurrence of the event</refpurpose>

Heh, yes indeed most baffling... Libxml must be performing some sort of cacheing, I guess. Doesn't appear to be requesting twice
(once with the if-modified-since header, and again without atleast)

>
> Anyhow, I have a workable solution which is sort of ok -- use
> file_get_contents() with a conditional get in a stream
> context to fetch a remote file on an "if-modified-since"
> basis, then stuff the string result into a new DOMDocument()
> object and have at it that way.
>
> But of course I'm puzzled as to why
> libxml_set_streams_context() is doing what it's doing, and it
> would be nice to know how to get it to work if it can and
> should work elsewhere for others.
>
> Thanks for a helpful reply.
>
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