Revert default urlencoding

1 files changed, 1 insertions, 1 deletions

diff --git a/oauthlib/common.py b/oauthlib/common.py
index 0676888..fc769c4 100644
--- a/oauthlib/common.py
+++ b/oauthlib/common.py
@@ -112,7 +112,7 @@ def urldecode(query):
     """
     # Check if query contains invalid characters
     if query and not set(query) <= urlencoded:
-        query = quote(query)
+        raise ValueError('Not a valid urlencoded string.')
 
     # Check for correctly hex encoded values using a regular expression
     # All encoded values begin with % followed by two hex characters