add file responses

src/android/Webserver.java

@@ -44,6 +44,10 @@ public class Webserver extends CordovaPlugin {
             this.sendResponse(args, callbackContext);
             return true;
         }
+        else if ("sendFileResponse".equals(action)) {
+            this.sendFileResponse(args, callbackContext);
+            return true;
+        }
         return false;  // Returning false results in a "MethodNotFound" error.
     }
 
@@ -96,6 +100,11 @@ public class Webserver extends CordovaPlugin {
         callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK));
     }
 
+    private void sendFileResponse(JSONArray args, CallbackContext callbackContext) throws JSONException {
+      this.responses.put('file', args.get(1));
+      callbackContext.sendPluginResult(new PluginResult(PluginResult.Status.OK));
+    }
+
     /**
      * Just register the onRequest and send no result. This is needed to save the callbackContext to
      * invoke it later