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With this parameter you can configure Modifications of HTTP Requests in the Web Dispatcher or ICM. You can define rules by which the Web Dispatcher/ICM changes the HTTP request before it forwards it (header field manipulation, URL rewrite, and so on)


Work area

Internet Communication Manager, SAP Web Dispatcher


Character string

Standard value

icm/HTTP/mod_0 =PREFIX=/ (no action file)

Dynamically changeable


Value Range and Syntax

The parameter has the following syntax:

icm/HTTP/mod_<xx> = PREFIX=<URL prefix>[, FILE=<action file>]

<xx> must be specified in ascending order from 0 .

Option FILE

With the optional parameter FILE you can specify the action file with the rules to apply. If only a file name without the full path is specified, the file must be in the working directory of the process.

The action file is a text file with one action (rule) per line. Comment lines begin with a hash sign ( # ).

You can find an example of an action file in Defining Modification Actions .

SAP Recommendation

To have the same filter rules on all instances, store the file with the filter rules in a global directory and set the parameter in the default profile DEFAULT.PFL.


The filter rules are in file icm_filter_rules.txt in directory $(DIR_GLOBAL)/security/data

icm/HTTP/mod_0 = PREFIX=/,FILE=$(DIR_GLOBAL)/security/data/icm_filter_rules.txt

More Information

Note the following documentation associated with this parameter:

Processing HTTP Requests

Generic Profile Parameters with Ending _<xx>