Hi,
I'm trying to read an rss feed with simplexml_load_file(). But on my Linode server (not with my local server) there is a problem with URL scheme.

If I try this as the source file: "http://www.domain.com/rss" it reads file just fine. But if I change URL to this: "http://www.domain.com/?feed=rss" it doesn't.

As I said there is no problem with both URLs on my development server. What could be the problem?

I'm not sure if http://www.domain.com/?feed=rss is technically a valid URL (even if it works). Try specifying the filename:

http://www.domain.com/whatever.php?feed=rss

RFC 3986 says it's cool... //www.domain.com/ is the hier-part, and ?feed=rss is the query. If http://www.domain.com/ works, then http://www.domain.com/?feed=rss should work. Whether it does the right thing is an implementation question...

What does http://www.domain.com/?feed=rss do instead of working, and why does http://www.domain.com/rss (which is a completely different object, with hier-part //www.domain.com/rss) work?

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Are you applying urlencode() to the URL by any means? That would screw up the question mark.