diff --git a/config.json b/config.json
index ee7ed58..e97d2d9 100644
--- a/config.json
+++ b/config.json
@@ -1,32 +1,35 @@
 {
     "randomSeed": 20,
+    "port": 8888,
     "captchaExpiryTimeLimit": 5,
+    "threadDelay": 2,
+    "throttle": 10,
     "captchas":{
         "FilterChallenge":{
             "name": "FilterChallenge",
             "supportedLevels":["medium", "hard"],
-            "supportedMedia":["image"],
+            "supportedMedia":["image/png"],
             "supportedinputType":["text"],
             "config":{}
         },
         "GifCaptcha":{
             "name": "GifCaptcha",
             "supportedLevels":["hard"],
-            "supportedMedia":["gif"],
+            "supportedMedia":["image/gif"],
             "supportedinputType":["text"],
             "config":{}
         },
         "ShadowTextCaptcha":{
             "name": "ShadowTextCaptcha",
             "supportedLevels":["easy"],
-            "supportedMedia":["image"],
+            "supportedMedia":["image/png"],
             "supportedinputType":["text"],
             "config": {}
         },
         "RainDropsCaptcha":{
             "name": "RainDropsCaptcha",
             "supportedLevels":["easy","medium"],
-            "supportedMedia":["image"],
+            "supportedMedia":["image/gif"],
             "supportedinputType":["text"],
             "config":{}
         }