Hello
You have a number of context variables to obtain all or parts of the http request:-
${request.url} would return the entire string, ${request.url.path} would return /GetProducts/v1/123123/, from here you could use an regular expression assertion to obtain the section required.
You can get parameters via:-
${request.http.parameter.<name>}
but this is for items after the a question mark in a url.
Regards
Christopher Clark
CA Support