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--- a/bottle.py
+++ b/bottle.py
@@ -309,13 +309,13 @@
 
     def path_filter(self, conf):
         return r'.*?', None, None
-    
+
     def add_filter(self, name, func):
         ''' Add a filter. The provided function is called with the configuration
         string as parameter and must return a (regexp, to_python, to_url) tuple.
         The first element is a string, the last two are callables or None. '''
         self.filters[name] = func
-    
+
     def parse_rule(self, rule):
         ''' Parses a rule into a (name, filter, conf) token stream. If mode is
             None, name contains a static rule part. '''
@@ -2465,10 +2465,10 @@
                     thread.interrupt_main()
                     break
             time.sleep(self.interval)
-    
+
     def __enter__(self):
         self.start()
-    
+
     def __exit__(self, exc_type, exc_val, exc_tb):
         if not self.status: self.status = 'exit' # silent exit
         self.join()