it's a context path.
I have an embedded version of Jetty for dev and a normal Jetty distro for production / staging.
This occurs in the Jetty that I build by myself using Java code.
Here is the code.. as I said I only use it so that I can run my system easily in Eclipse.
ServletHolder sdkHld = new ServletHolder();
sdkHld.setClassName(DefaultServlet.class.getName());
sdkHld.setDisplayName("Resources Servlet");
sdkHld.setAsyncSupported(false);
sdkHld.setEnabled(true);
sdkHld.setInitParameter("cacheControl", "max-age=0, no-cache, no-store");
sdkHld.setInitParameter("useFileMappedBuffer", "false");
sdkHld.setInitParameter("gzip", "false");
sdkHld.setInitParameter("etags", "true");
sdkHld.setInitParameter("redirectWelcome", "false");
sdkHld.setInitParameter("welcomeServlets", "false");
sdkHld.setInitParameter("dirAllowed", "true");
sdkHld.setInitParameter("maxCachedFiles", "2048");
sdkHld.setInitParameter("maxCachedFileSize", "200000000");
sdkHld.setInitParameter("maxCacheSize", "256000000");
sdkHld.setInitParameter("acceptRanges", "true");
sdkHld.setInitParameter("aliases", "true");
sdkHld.setInitParameter("acceptRanges", "true");
sdkHld.setInitParameter("resourceBase", cfg.sdkRootDir.getAbsolutePath());
ServletContextHandler sdkContextHandler = new ServletContextHandler(ServletContextHandler.NO_SECURITY
| ServletContextHandler.NO_SESSIONS);
// ============>>> here it is ===========>
sdkContextHandler.setContextPath("/js");
sdkContextHandler.setDisplayName("IOD SDK Resources Servlet Context");
sdkContextHandler.addServlet(sdkHld, "/*");
sdkContextHandler.setInitParameter("resourceBase", cfg.sdkRootDir.getAbsolutePath());
sdkContextHandler.setInitParameter("cacheControl", "max-age=0, no-cache, no-store");
sdkContextHandler.setInitParameter("useFileMappedBuffer", "false");
sdkContextHandler.setInitParameter("gzip", "false");
sdkContextHandler.setInitParameter("etags", "true");
sdkContextHandler.setInitParameter("redirectWelcome", "false");
sdkContextHandler.setInitParameter("welcomeServlets", "false");
sdkContextHandler.setInitParameter("dirAllowed", "true");
sdkContextHandler.setInitParameter("maxCachedFiles", "2048");
sdkContextHandler.setInitParameter("maxCachedFileSize", "200000000");
sdkContextHandler.setInitParameter("maxCacheSize", "256000000");
sdkContextHandler.setInitParameter("acceptRanges", "true");
sdkContextHandler.setInitParameter("aliases", "true");
sdkContextHandler.setInitParameter("acceptRanges", "true");
sdkContextHandler.setInitParameter("resourceBase", cfg.sdkRootDir.getAbsolutePath());
sdkContextHandler.setServer(server);