Reverse Proxy

 

Hi,

 

 

I'm trying to use irules to make a reverse proxy from an LTM. User connects to a portal server defined as a pool. I scrub the data coming back and rewrite all URLs to use the F5 and remember the original url in a query.

 

 

When the user clicks on a URL, the F5 reads the original URL, attempts to rewrite the URI and set the host to the original hostname. It then does a name lookup and attempts to forward the request to the original server in the URL.

 

 

Trouble is:

 

 

1.) The host in the header doesn't seem to get rewritten

 

2.) The F5 does seem to forward the request to the correct node.

 

 

Here's the HTTP_REQUEST code. (I know there's a better way to parse the URI. just haven't cleaned that up yet.) Suggestion appreciated.

 

 

when HTTP_REQUEST {

 

Don't allow data to be chunked

 

log local0. "in request - Cole"

 

if { [HTTP::version] eq "1.1" } {

 

if { [HTTP::header is_keepalive] } {

 

HTTP::header replace "Connection" "Keep-Alive"

 

}

 

HTTP::version "1.0"

 

}

 

 

 

 

if uri = pxy?orig_url then get new url, set host, set uri

 

 

 

if { [HTTP::query] starts_with "orig_url"} {

 

set qry [lindex [split [HTTP::query] '"="] 1]

 

 

set newhost [getfield $qry "/" 3]

 

log local0. "newhost&uri"

 

log local0. $newhost

 

 

set index [string first $newhost $qry]

 

set strlen [string length $newhost]

 

set uindex [expr $index + $strlen ]

 

set newuri [string range $qry $uindex end]

 

 

log local0. "$newuri"

 

 

HTTP::header replace "Host" $newhost

 

HTTP::uri $newuri

 

 

log local0. "Host = [HTTP::host]"

 

log local0. "Newhost = $newhost"

 

 

NAME::lookup $newhost

 

 

}

 

}

 

 

when NAME_RESOLVED {

 

 

log local0. "noding"

 

 

log local0. $newhost

 

log local0. [NAME::response]

 

node [NAME::response] 80

 

 

}