Hosts that share one wildcard cert (e.g. hassio.718it.biz and
metrics.718it.biz under *.718it.biz) resolve to the same IP, so browsers
coalesce them onto a single HTTP/2 connection. The SSL request_domain
phase resolves the connection's first host and caches it in
ngx.ctx.targetInfo; the unguarded `if targetInfo then return targetInfo`
then handed that first host's target to every coalesced request on the
connection -- e.g. hassio.718it.biz served from metrics' 192.168.1.8:8088.
Confirmed via debug logging: for GET requests to hassio.718it.biz on a
coalesced connection, ngx.ctx already held metrics' IP and the function
short-circuited to it.
Guard the reuse by host: only return the cached target when
ngx.ctx.targetInfo_domain matches the requested domain, and record that
domain whenever a target is resolved. A coalesced request for a different
host now re-resolves against its actual Host header.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
wmantly
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