resource-middleware.js

        respond: function (req, res) {

            if (!handle(req.url)) { return; }

            var resource;
            var parsedUrl = parseUrl(req.url);
            var path = parsedUrl.pathname;
            var mimeType = parsedUrl.params.rampMimeType;
            var mounted = getMounted(path);

            // if no mount explicitly specified
            // scrap it from the cookie
            // and check if resource exists
            var contextPath = ((req.headers.cookie || '').match(/buster_contextPath=([^;]+)(;|$)/) || [])[1];

            if (!mounted && contextPath) {

              mounted = getMounted(contextPath);

              // adjust path to check for the resource
              if (mounted) {
                parsedUrl = parseUrl(mounted.mountPoint + req.url);
                path      = parsedUrl.pathname;
                mimeType  = parsedUrl.params.rampMimeType;
              }

              // trying to get resource with new path
              resource = getResource(mounted, resourcePath(mounted, path), mimeType);

              // this is for real so adjust request
              if (resource) {
                req.url = mounted.mountPoint + req.url;
              } else {
                // didn't work out, put everything back
                parsedUrl = parseUrl(req.url);
                path      = parsedUrl.pathname;
                mimeType  = parsedUrl.params.rampMimeType;
                mounted   = getMounted(path);
              }
            }
            else
            {
              resource = getResource(mounted, resourcePath(mounted, path), mimeType);
            }