NetScaler content switching vs. F5 iRule - instream rewrite

Question

I am migrating a configuration from NetScaler to F5.  I need to replicate the content switching capability on the NetScaler with an iRule on the F5.  The client sends "/path1/file.aspx" the server sees "/path2/file.aspx".  I also need to reverse it on the way back out, so that the client always sees "/path1/file.aspx".  The code for the inbound rewrite is easy...
when HTTP_REQUEST {
  HTTP::uri [string map {"/path1/file.aspx" "/path2/file.aspx"} [HTTP::uri]]
}
How do I so the same on the outbound.  I assume I have to use an HTTP_RESPONSE event, but the syntax is eluding me.  Cane someone offer some assistance?  Or better yet, a code example?&nbsp;

r_eastman_13667 · Answer

when HTTP_RESPONSE{ HTTP::uri [string map {"/path2/file.aspx" "/path1/file.aspx"} [HTTP::uri]] } &nbsp;

mathew_loesch · Answer

Unfortuately, that won't work. The LTM gives me the following error: 1070151:3: Rule [/Common/dbrewrite] error: /Common/dbrewrite:4: error: [unknown event (HTTP_RESPONSE{)][when HTTP_RESPONSE{ HTTP::uri [string map {"/path2/file.aspx" "/path1/file.aspx"} [HTTP::uri]] }]

mathew_loesch · Answer

I tried that originally. Unfortunately, the HTTP_RESPONSE and the HTTP_REQUEST have totaly different command options. I cannot use an HTTP::uri in the RESPONSE event.&nbsp;

shaggy · Answer

There is no HTTP::uri object in an HTTP response since the URI is the requested resource location in a request. Are you trying to replace references to the URI in the response content or a redirect location?

r_eastman_13667 · Answer

Maybe something like this in the HTTP_RESPONSE event. Make sure to enable stream profile on the VIP.
if {[HTTP::header value Content-Type] contains "text"} {STREAM::expression {@/path2/file.aspx@/path1/file.aspx@} }

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NetScaler content switching vs. F5 iRule - instream rewrite

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