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Dridi Boukelmoune authored
A VCL failure on the client side transitions to vcl_synth, except failures from vcl_synth that lead to minimal errors. The ESI transport is not allowed to reply with minimal responses so this would lead to a panic. On top of that, the vcl_req_reset feature flag emulates `return (fail)` statements when an HTTP/2 client disconnected, resulting in the same panic scenario. For sub-requests, we masquerade the fail transition as a deliver and trade the illegal minimal response for the synthetic response. Fixes #4022 Conflicts: bin/varnishd/cache/cache_req_fsm.c
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