How to handle errors when using esi tags?

[Felipe Santiago]

Hi,

I've been trying to use <esi:include src="/foo" alt="/bar"/> to execute a
subrequest to /bar in case /foo fails, however I didn't manage to make it
work. Do you support the alt attribute? If my backend returns a 4xx or 5xx,
is that considered an error?

I also found in the documentation some references on how to do that using
the esi:remove, but I didn't have success either.  Any suggestions?

Thanks in advance.

Felipe Santiago
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