encoded to utf-8

Author: martyni

oauth2/__init__.py

@@ -489,7 +489,9 @@ def sign_request(self, signature_method, consumer, token):
             # http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html
             # section 4.1.1 "OAuth Consumers MUST NOT include an
             # oauth_body_hash parameter on requests with form-encoded
-            # request bodies. "
+            # request bodies."
+            if not self.body:
+               self.body = ''.encode('utf-8')
             self['oauth_body_hash'] = base64.b64encode(sha1(self.body).digest())
 
         if 'oauth_consumer_key' not in self: