apachedex: Add support for non-standard 444 and 499 status codes.

Give them captions.
Also, tread 499 as a non-error: client closed the connection before server
could respond, so it is likely not something the server could be
considered responsible for. Of course, the response time still matters,
so if these statuses come after slow responses it will still affect the
score.

apachedex/__init__.py

@@ -131,8 +131,13 @@ AUTO_PERIOD_COEF = 200
 LARGER_THAN_INTEGER_STR = 'A'
 SMALLER_THAN_INTEGER_STR = ''
 
+HTTP_STATUS_CAPTION_DICT = httplib.responses.copy()
+# Non-standard status codes
+HTTP_STATUS_CAPTION_DICT.setdefault(499, 'Client Closed Request')
+HTTP_STATUS_CAPTION_DICT.setdefault(444, 'No Response')
+
 def statusIsError(status):
-  return status[0] > '3'
+  return status[0] > '3' and status != '499'
 
 def getClassForDuration(duration, threshold):
   if duration <= threshold:
@@ -455,7 +460,7 @@ class GenericSiteStats(object):
       return '<td class="%s">%s</td>' % (getClassForStatusHit(hit, status), hit)
     def statusAsHtml(status):
       try:
-        definition = httplib.responses[int(status)]
+        definition = HTTP_STATUS_CAPTION_DICT[int(status)]
       except KeyError:
         return status
       else: