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From Brian Akins <>
Subject Re: Flexible Handlers
Date Tue, 04 Oct 2005 15:25:50 GMT
Nick Kew wrote:
> The current implementation of handlers is a little bizarre, with each
> handler both having to register itself and check its own name.

Some people, myself included, have handlers that run even when they 
aren't "set," ithey never check r->handler and always returns DECLINED. 
  Yes, I know this is bad and should be done in fixups probably, but I'm 
sure this may break some things.

That being said.  I have always found it strange that everything has to 
check r->handler.

> appear anywhere in the list, so "fall back to my CGI if there's no file of 
> that name" becomes "AddHandlerByExt .html default cgi-script".
> ErrorDocuments are invoked when we fall off the end of the list.

What about cases like this?

<Location /stuff>
	SetHandler stuff-handler

where stuff may have all sorts of extensions.

> For a slightly bigger change, we can use ap_provider on top of that to
> declare and reference handlers.

This is interesting. But what if we had a "handler chain" much like a 
filter chain?  First one to return OK stops the chain.  Chains could be 
built up as one shots (like SetHandler) or more elaborate like 
mod_filter does with filters.  the default_handler in core could always 
be added to the end.

Brian Akins
Lead Systems Engineer
CNN Internet Technologies

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