Vanity url not caching with redirect html extension

Hi All,

We are using vanity urls for bulk of pages like below. Could you please help here 

to cache and invalidate the vanity urls. 

/product/data/feature/test1.html

test1 is dynamic

I am able to the vanity url data in publish

http://localhost:4503/libs/granite/dispatcher/content/vanityUrls.html

 i have added the below things to dispatcher.

farm file:

/vanity_urls { 

/url "/libs/granite/dispatcher/content/vanityUrls.html"

/file "/tmp/vanity_urls"

/delay 300

}

filter :

/0100 { /type "allow" /url "/libs/granite/dispatcher/content/vanityUrls.html" }

Thanks for help.