New Possibility in CFMX: Server-Side Redirects @ COLDFUSION DEVELOPER'S JOURNAL

New Possibility in CFMX: Server-Side Redirects

Now that we can talk freely about ColdFusion MX, I want to share something new that you likely won't hear much about but that I think stands to be an important feature: server-side redirects, or 'forwards.'

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Patrick Correia commented on the 7 May 2003

According to the release notes for CFMX Updater 3, Macromedia claims this problem has been fixed.

charles arehart commented on the 26 Jun 2002

Folks, just wanted to share a couple updates about the article. I had mentioned there were two "problems" in the release candidate of CFMX, which was the latest version when I wrote the article. Since then, the final version has come out, but the "problems" remain.

Actually, there is only one bug. The other is just something to understand.

The bug is that if you try to do a forward from a page that's a FORM action page, it fails with an error "err.io.short_read". That is a recognized (and very unfortunate) bug, that perhaps we can hope will be fixed in some sort of patch or service pack.

The other problem I'd mentioned, that FORM and URL variables weren't put in the REQUEST scope, is just something to understand. It makes sense in CF's design that this is not the case. The REQUEST scope isn't written to automatically at all. It's only for you to put things into it. But there is good news that mitigates this somewhat.

Let me first clarify that the only reason one would expect this would be from experience with either ASP or JSP, which put form posts and query strings into a "request" scope of sorts.

The good news is that, usually, any URL vars that exist on the calling page will be available on the page to which you forward. So it's not necessary to put them in the REQUEST scope to be able to access them (of course, with FORM vars not working at all, I can't vouch that this should work for them, but it's reasonable to expect).

But I've noticed one quirk: if the URL used in the forward has a query string specified, then that seems to cancel out the availability of the URL vars that were available on the calling page. It's as if passing any on the forward URL blocks any that had been passed to the forwarding page.

Oh well. Maybe that will be observed and resolved as a bug.

/charlie

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