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Web / Caddy Server Interview questions

What is the difference between Caddy v1 and Caddy v2?
AspectCaddy v1Caddy v2
ArchitectureMonolithic, directives hardcoded into the coreModular; features are pluggable modules assembled via xcaddy
Native configCaddyfile onlyJSON is native; Caddyfile is adapted to JSON
Runtime APILimitedFull admin API for live, partial config changes
LicenseRequired a paid license for commercial use in some versionsFully open-source (Apache 2.0)
ProtocolsHTTP/1.1, HTTP/2Adds HTTP/3 (QUIC) support

Caddy v2 was a ground-up rewrite rather than an incremental release, which is why Caddyfiles and plugins from v1 are not compatible with v2 without changes. Nearly all current production deployments and documentation refer to v2.

A defining architectural change from v1 to v2 was:
Which protocol did Caddy v2 add that v1 lacked?

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