Rewrite portion of URI?

What we are trying to do is dynamically replace the word someservice with someservice.svc in the URI string.

To literally do that you can use string map:

  
 when HTTP_REQUEST {  
     Replace someservice with someservice.svc in the path of the request.  Leave everything else in the path intact.  
    HTTP::path [string map -nocase {someservice someservice.svc} [HTTP::path]]  
    log local0. "[IP::client_addr]:[TCP::client_port]: Rewrote [HTTP::path] to\ 
       [string map -nocase {someservice someservice.svc} [HTTP::path]]"  
 }  
 

If you don't expect the someservice string to be in a majority of requests, you could first check to see if the path contains someservice before trying to rewrite it with HTTP::path.

Aaron