public WebSocketServiceBuilder allowedOrigins(String... allowedOrigins) {
        return allowedOrigins(ImmutableSet.copyOf(requireNonNull(allowedOrigins, "allowedOrigins")));
    }
Sets the allowed origins. The same-origin is allowed by default.
Specify {@value ANY_ORIGIN} to allow any origins.

@see <a href="https://datatracker.ietf.org/doc/html/rfc6455#section-10.2">Origin Considerations</a>
core/src/main/java/com/linecorp/armeria/server/websocket/WebSocketServiceBuilder.java