Save a string concatenation per log line when not required.

apachedex/__init__.py

@@ -678,8 +678,8 @@ DURATION_US_FORMAT = '%D'
 DURATION_S_FORMAT = '%T'
 
 server_name_group_dict = {
-  '%v': lambda x: x.group('servername') + '/',
-  '%V': lambda x: x.group('canonical_servername') + '/',
+  '%v': lambda x, path: x.group('servername') + '/' + path,
+  '%V': lambda x, path: x.group('canonical_servername') + '/' + path,
 }
 
 logformat_dict = {
@@ -1174,7 +1174,7 @@ def main():
     parser.error('--match-servername %s requested, but missing '
       'from logformat.' % args.match_servername)
   get_url_prefix = server_name_group_dict.get(args.match_servername,
-    lambda _: '')
+    lambda _, path: path)
   line_regex = ''
   expensive_line_regex = ''
   try:
@@ -1318,7 +1318,7 @@ def main():
       url = url_match.group('url')
       if url.startswith('http'):
         url = splithost(splittype(url)[1])[1]
-      url = get_url_prefix(match) + url
+      url = get_url_prefix(match, url)
       for site, prefix_match, action in site_list:
         if prefix_match(url) is not None:
           break