Flash can now serve HTTPS and WSS, on one or many listeners per app: - FlashConfiguration gains an optional `tls` field for the single default listener, and a `listeners` list for apps that bind multiple ports (each independently plain or TLS). - New dev.relism.flash.tls package: TlsConfig.keystore(path, password) builds an SSLContext from a PKCS12/JKS keystore, with SNI-based certificate selection for free when the keystore holds more than one alias (matched by SAN/CN, pure JDK APIs). TlsConfig.ofContext(sslContext) is a full escape hatch — Flash never calls setSSLParameters on that path, so caller-set protocols/cipher suites/ALPN survive untouched. TlsConfig.clientAuth(...) adds optional/required mTLS on either path. - HttpServer moves from a single ServerSocket to a list of bound listeners; the per-request hot path (RequestParser, routing, response writing) is untouched — TLS only changes which bytes come out of accept(), so WSS needs no separate code path from WS. - process()'s catch is widened to log non-IOException failures (e.g. a misbehaving custom KeyManager/TrustManager on the ofContext path) instead of swallowing them silently; the failure was already isolated to the one connection via the existing try-with-resources/executor-submission boundary — this only fixes the missing log line. - Fixes a pre-existing gap where FlashConfiguration#host was accepted but never used to bind (listeners always bound to the wildcard address). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>