Add 500px check

removed_sites.json

@@ -363,15 +363,6 @@
     "username_claimed": "blue",
     "username_unclaimed": "noonewouldeverusethis7"
   },
-  "500px": {
-    "errorMsg": "Oops! This page doesn\u2019t exist.",
-    "errorType": "message",
-    "regexCheck": "^[a-z0-9_]+$",
-    "url": "https://500px.com/{}",
-    "urlMain": "https://500px.com/",
-    "username_claimed": "blue",
-    "username_unclaimed": "noonewouldeverusethis7"
-  },
   "PayPal": {
     "errorMsg": "<meta name=\"twitter:title\" content=\"Get your very own PayPal.Me link\" />",
     "errorType": "message",

removed_sites.md

@@ -729,22 +729,6 @@ As of 2020-08-11, YandexCollection presents us with a rechapta which prevents us
   },
 ```
 
-## 500px
-
-As of 2020-08-24, 500px now returns false positives, which was found when running the tests, but will most likley be added again in the near
-future once we find a better error detecting method.
-```
-  "500px": {
-    "errorMsg": "Oops! This page doesn\u2019t exist.",
-    "errorType": "message",
-    "regexCheck": "^[a-z0-9_]+$",
-    "url": "https://500px.com/{}",
-    "urlMain": "https://500px.com/",
-    "username_claimed": "blue",
-    "username_unclaimed": "noonewouldeverusethis7"
-  },
-```
-
 ## PayPal
 
 As of 2020-08-24, PayPal now returns false positives, which was found when running the tests, but will most likley be added again in the near

sherlock/resources/data.json

@@ -28,6 +28,15 @@
     "username_claimed": "blue",
     "username_unclaimed": "noonewouldeverusethis7"
   },
+  "500px": {
+    "errorMsg": "No message available",
+    "errorType": "message",
+    "urlProbe": "https://api.500px.com/graphql?operationName=ProfileRendererQuery&variables=%7B%22username%22%3A%22{}%22%7D&extensions=%7B%22persistedQuery%22%3A%7B%22version%22%3A1%2C%22sha256Hash%22%3A%224d02ff5c13927a3ac73b3eef306490508bc765956940c31051468cf30402a503%22%7D%7D",
+    "url": "https://500px.com/p/{}",
+    "urlMain": "https://500px.com/",
+    "username_claimed": "blue",
+    "username_unclaimed": "noonewouldeverusethis7"
+  },
   "About.me": {
     "errorType": "status_code",
     "url": "https://about.me/{}",