Re: autoflush behavior for subrequests

On Thu, 16 Sep 2004, Jonathan Swartz wrote:

> In my experience, most people use subrequests for "internal redirects",
> and this is how they expect (or would like) them to work:

Where "most must not be me".  I've never done this.

> 1. Any current contents of the parent buffer are cleared.
> 2. The out_method of the subrequest is the same as the out_method of the
> parent.
> 3. autoflush or manual flush_buffers take effect immediately.
> 4. If the subrequest returns successfully, the parent aborts (so as not
> to generate any more output) with the return value (if any) of the
> subrequest.
> 5. If the subrequest aborts, the parent aborts with the aborted value.
> 6. If the subrequest dies with an error, the error gets handled in the
> same way as if the parent had generated it.
>
> Perhaps we should have a $m->internal_redirect() that uses $m->subexec()
> underneath but guarantees the above behavior.

That sounds like a reasonable idea.  I certainly would want to change
subexec to implement the above, since that'd break lots of code.

> Other people try to use subrequests as mere glorified component calls
> with dhandlers and autohandlers turned on. (This seems rarer because,
> for one thing, you've got to deal with the double content wrapping
> problem.) Because this use case is less frequent, we don't have to worry
> as much about the default subrequest behavior supporting it.

This is the _only_ way I've ever used this feature!  It's handy sometimes
to have bits of library code which share an autohandler, but are not
top-level components.

Honestly I don't see the point of internal redirects.  If I want a
redirect I'll issue one.  IMO one a given URI should always point to the
same page.  Internal redirects (Apache or otherwise) break that.


-dave

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