InstanceInfoBuilder port(int port) {
        checkArgument(port > 0, "port: %s (expected: > 0)", port);
        this.port = new PortWrapper(true, port);
        return this;
    }
Sets the port used for {@link SessionProtocol#HTTP}.
eureka/src/main/java/com/linecorp/armeria/server/eureka/InstanceInfoBuilder.java