Merge pull request #481 from lixxu/master

url_for has something wrong with //

sanic/app.py

@@ -270,7 +270,7 @@ class Sanic:
                     'Endpoint with name `{}` was not found'.format(
                         view_name))
 
-        if uri.endswith('/'):
+        if uri != '/' and uri.endswith('/'):
             uri = uri[:-1]
 
         out = uri

sanic/blueprints.py

@@ -41,7 +41,7 @@ class Blueprint:
             # Prepend the blueprint URI prefix if available
             uri = url_prefix + future.uri if url_prefix else future.uri
             app.route(
-                uri=uri,
+                uri=uri[1:] if uri.startswith('//') else uri,
                 methods=future.methods,
                 host=future.host or self.host
                 )(future.handler)