diff --git a/backend/app_sdk/app_base.py b/backend/app_sdk/app_base.py
index a751319b..78f993f8 100755
--- a/backend/app_sdk/app_base.py
+++ b/backend/app_sdk/app_base.py
@@ -288,6 +288,27 @@ def split(base, sep):
         return base.split(sep)
 
 
+@shuffle_filters.register
+def url_encode(base):
+    """url-encode a string"""
+    try:
+        from urllib import quote
+    except ImportError:
+        from urllib.parse import quote
+
+    return quote(base)
+
+@shuffle_filters.register
+def url_decode(base):
+    """url-decode a string"""
+    try:
+        from urllib import unquote_plus
+    except ImportError:
+        from urllib.parse import unquote_plus
+
+    return unquote_plus(base)
+
+
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