diff --git a/app.py b/app.py
index 00b1d04..2da1acf 100644
--- a/app.py
+++ b/app.py
@@ -8,8 +8,11 @@ app = Flask(__name__)
 
 @app.route("/")
 def hello():
-    cal_str = urllib.request.urlopen(
-        "***REMOVED***").read()
+    url = os.environ.get('URL', None)
+    if url is None:
+        return ""
+    
+    cal_str = urllib.request.urlopen(url).read()
 
     FILTERED_EVENTS = [
         'MGL',
@@ -18,8 +21,9 @@ def hello():
         'COM',
         'RSM',
         'ANG1',
-        'DLG',
-        'SPO',
+        'DLG1',
+        'SPO1',
+        'SPO2',
         'STA1',
         'PST',
         'SEC',