URL rewrite

I am making an assumption that the random file name is a file that ends with ".txt". You can change it to anything else you want.

The following will send a redirect and hence, the browser URL will change:

when HTTP_REQUEST {
if { ([HTTP::host] eq "website.com") and ([HTTP::uri] ends_with ".txt") } {
HTTP::uri /processor/makesstuff/here[HTTP::uri]
HTTP::respond 301 Location "http://[HTTP::host][HTTP::uri]"
}
}

This will change the URL between F5 & Server. However, you would need to provide more information on the exact URL or you can modify the following to suit your needs.

when HTTP_REQUEST {
if { ([HTTP::host] eq "website.com") and ([HTTP::uri] ends_with ".txt") } {
HTTP::uri /processor/makesstuff/here[HTTP::uri]
pool POOL_ABC
}
}

when HTTP_RESPONSE {
if { [HTTP::header values Location] contains "/processor/makesstuff/here/" } {
HTTP::header replace Location [string map {"/processor/makesstuff/here/" "/"} [HTTP::header value Location]]
}
}