modgzip2dlf(1) convert Common Log Format with mod_gzip extensions web server log files to DLF


modgzip2dlf file


modgzip2dlf converts web server log file in the common log format with extensions for mod_gzip to www DLF.

mod_gzip is an Apache extension developed by RemoteCommunications, Inc. Sourcecode is free available from More informations can be found at

mod_gzip can log informations about the compression of pages by configuring Apache to log using the 'gzip' format which can be defined as follows:

 LogFormat "%h %l %u %t \"%r\" %>s %b %{mod_gzip_result}n %{mod_gzip_compression_ratio}n" gzip


The mod_gzip extensions adds two fields to the Common Log Format; see common2dlf(1):

  gzip_result compression_ratio
The gzip's result code. Usually OK.
The ratio by which the content was compressed. A number from 0 to 100.

Log example :

  127.0.01 - - [11/03/2001 12:12:01 -0400] "GET / HTTP/1.0" 200 252 "-" "Mozilla/5.0" OK 49 - francis [11/03/2001 12:14:01 -0400] "GET /secret/ HTTP/1.0" 200 300 "" "Mozilla/5.0" OK 74


To process a log as produced in the modgzip logformat:

 $ modgzip2dlf < common.log

modgzip2dlf will be rarely used on its own, but is more likely called by lr_log2report:

 $ lr_log2report modgzip < /var/log/httpd/common.log


Joost van Baal <[email protected]>, Francis J. Lacoste <[email protected]> and Egon Willighagen <[email protected]>, based on an idea by Edwin Groothuis


$Id:,v 1.10 2006/07/23 13:16:36 vanbaal Exp $


Copyright (C) 2000, 2001 Stichting LogReport Foundation [email protected]

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