At the risk of looking like a newbie, is this supposed to work?: when HTTP_REQUEST { HTTP::host "foo.bar.com" HTTP::uri "/some_uri" } Darned if I can get it to work, at least on v9.3.1: BIGpipe: rule modification error: 01070151:3: Rule [my_rewrite] error: line 2: [wrong args] [HTTP::host "foo.bar.com"] I see lots of examples of rewriting HTTP::uri, or redirecting via a 302, but don't see any mechanism to directly rewrite the destination host.domain. What am I missing? Thx.

Hi, you should try with the command HTTP::header replace HTTP::header replace "Host" foo.bar.com HTH N.

My bad on that one. Sorry about the bad suggestion. For the host header, you'll need to use the "HTTP::header replace" command as suggested here. -Joe

...which rewrites the header, but doesn't actually send the request to foo.bar.com, right? I still need a pool with one or more hard-coded ip addresses. This is the essential issue: can I take a connection to a virtual, and send it out to some external domain, using standard DNS resolution so I don't have hard-coded ip addresses? And thanks for the reply.

Yes the command will only replace the HTTP header but will not route this request to this new domain Can you explain a little more what you want to achieve? i'm not sure to understand :s

Sure. Let's say your company has an app that connects to a web service from an external vendor. And you need to get to that app via "bar.foo.com/widget/some_uri". Now, your internal app server isn't on a routable IP address, so you'd like to go thru the F5, and have it proxy the communication with the external host. However, foo.com may have their own load balancing, or dns round-robin, or decide to change the ip address of host "bar" next week. Therefore, you can't have hard-coded ip address(es) as your pool member(s), or you'll have an outage every time they make a change. Therefore, you'd like to have the F5 resolve this host.domain - and preferably not cache it forever between restarts. Again, I can't help but feel I'm missing something basic here. So thanks for bearing with me, and for any suggestions.

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