How can i redirect traffic in my URL map configuration

[mountaincode2]

I have the following:

http://34.117.1.48

http://34.117.1.48/images/

[Query] How can i redirect all requests from http://34.117.1.48/images/<anything> to http://34.117.1.48/images/three-cats.jpg

Presently, my path rules are as follows:

defaultService: projects/test-case2-b/global/backendServices/cross-ref-backend-service

name: test-path-matcher

pathRules:

- paths:

  - /images/*

  service: projects/test-case2-b/global/backendBuckets/cross-ref-backend-bucket

Now, i guess i need to use route rules:

https://cloud.google.com/load-balancing/docs/l7-internal/traffic-management#route_rules

But how do i go about setting it up. 

Any pointers would be helpful.

Thank you!