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The plaintext listener bound `:PORT`, so it answered on every interface with no way to say otherwise. That published the admin UI and the unauthenticated receiver in cleartext beside whatever TLS proxy was in front of them, reachable from any host that could route to the machine. BIND_ADDRESS now selects the address. The binary defaults to 127.0.0.1, which is the safe answer for a bare host: reaching webhooker from elsewhere becomes a deliberate act. The image sets 0.0.0.0, which is the correct answer inside a container, where the network namespace is already the boundary and exposure is decided by the publish flag instead — so `-p 127.0.0.1:8080:8080` is what the README shows. Existing container deployments are unaffected. Only IP address literals are accepted: hostnames, host:port and CIDR blocks abort startup naming the variable and the value, and a literal that is not an address of this host fails at listen and exits non-zero. The http.Server is now built in New rather than in the serving goroutine, and sentryEnabled is atomic. Both fields were written by the serving goroutine and read by the fx stop hook with nothing ordering them, and the OnStart hook returns before that goroutine has necessarily run: cleanShutdown could dereference a nil httpServer on an early SIGTERM, and both reads raced. No test started and stopped the server, so nothing observed it. Closes #226. README gains a "Deployment behind a reverse proxy" section: a working nginx server block, and the five things that are silent when wrong — bind or firewall the app port, WEBHOOKER_ENVIRONMENT=prod, TRUSTED_PROXIES, Host as $http_host rather than $host, and keeping the proxy's access log because webhooker's own records only the proxy.