varnish-cache
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ESI onerror="abort" handling for OC_F_FAILED
noticed en passant : We should probably also abort for this case
https://github.com/varnishcache/varnish-cache/blob/903611966b88aa464d22a9867411f31790b505f9/bin/varnishd/cache/cache_esi_deliver.c#L900-L904
Noted as part of discussion: ESI spec says
»If an ESI Processor can fetch neither the src nor the alt, it returns a HTTP status code greater than 400 with an error message, unless the onerror attribute is present.«