Logging Compression Results

The following three directives can be added to the httpd.conf file to enable the writing of compression statistics to a log file. These directives will record the bytes before compression (Input), the bytes after compression (Output), and calculate the compression ratio:

DeflateFilterNote Input instream
DeflateFilterNote Output outstream
DeflateFilterNote Ratio ratio

The following line defines a new logging format to be used for the compression log. The format is named "deflate." The second line below specifies the path and file name of the log file (deflate.log) where the output is written.

LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
CustomLog Z:\IBM\HTTPServer\logs\deflate.log/u01/IBM/HTTPServer/logs/deflate.log deflate