error pages shouldn't trip the 503 rate limiter

r2/r2/controllers/error.py

@@ -85,6 +85,7 @@ class ErrorController(RedditController):
     allowed_render_styles = ('html', 'xml', 'js', 'embed', '')
     def __before__(self):
         try:
+            c.error_page = True
             RedditController.__before__(self)
         except:
             handle_awful_failure("Error occurred in ErrorController.__before__")

r2/r2/controllers/reddit_base.py

@@ -433,7 +433,8 @@ class RedditController(BaseController):
         g.cache.caches = (LocalCache(),) + g.cache.caches[1:]
 
         #check if user-agent needs a dose of rate-limiting
-        ratelimit_agents()
+        if not c.error_page:
+            ratelimit_agents()
 
         # the domain has to be set before Cookies get initialized
         set_subreddit()