Force patched responseData to a string

Author: cwisecarver

lib/server.js

@@ -249,7 +249,7 @@ exports.Server = function Server(bsClient, workers, config, callback) {
           }
         });
       } else {
-        patchResponse(responseData, headers, function (data, headers) {
+        patchResponse(responseData && responseData.toString(), headers, function (data, headers) {
           callback && callback(data, headers);
         });
       }