Convert Carbonmade to use Response URL detection. This is much more robust than the Error Message method. There are some odd things going on with this site... When I manually try certain user names, I get forwarded to other usernames. I suspect that there is some aliasing going on in the background. The detection for this site is probably not quite correct. But, it definitly works better than before. Add to tests.

data.json

@@ -139,11 +139,13 @@
     "username_unclaimed": "xgtrq"
   },
   "Carbonmade": {
-    "errorMsg": "You've accidentally stumbled upon Mike's super secret nap grotto.",
-    "errorType": "message",
+    "errorType": "response_url",
+    "errorUrl": "https://carbonmade.com/fourohfour?domain={}.carbonmade.com",
     "rank": 31911,
     "url": "https://{}.carbonmade.com",
-    "urlMain": "https://carbonmade.com/"
+    "urlMain": "https://carbonmade.com/",
+    "username_claimed":   "jenny",
+    "username_unclaimed": "noonewouldeverusethis7"
   },
   "CashMe": {
     "errorType": "status_code",