code: public HttpServerBuilder contentFrom(final String contextRoot, final TemporaryFolder folder) {
          resources.put(contextRoot, folder);
          return this;
      }
docs: Defines a folder  resource whose content fill be hosted
  rule.
  @param contextRoot
  the root path to the content
  @param folder
  the rule that creates the temporary folder that should be hosted by the http server.
  @return
  this builder