Http request: Stem Analysis

How to start analysis [Analyze]-[Request Analysis]-[Http request: Stem]
Description

Display stems in http request and counts.

Stem in http request is written in red.
GET http://www.server.com/apply.cgi?param1=A&param2=B HTTP/1.0

Description for each access log format

Witness access log

N/A
NCSA common access log Applicable, if %r exists
W3C extended access log Applicable, if cs-uri-stem or cs-uri exists
IIS access log N/A