Note that this implementation of the :WebserverService interface is based on Jetty 9, which contains performance improvements over previous versions of Jetty that may be significant depending on your application. This service requires JRE 1.7 or greater; however, the interface is intended to be agnostic to the underlying web server implementation. We also provide a Jetty 7 version of the service, which can be used interchangeably with this one and will support older JDKs. You should only need to change your lein dependencies and your bootstrap.cfg file--no code changes.The web server is configured via the trapperkeeper configuration service; so, you can control various properties of the server (ports, SSL, etc.) by adding a webserver section to one of your Trapperkeeper configuration files, and setting various properties therein. For more info, see Configuring the Webserver. It is possible to configure both a single webserver or multiple webservers.