How to change the uri in a request?

Hi. I am a brand new to writing iRules here and this seems like it should be easy but I can't see what my problem is. I am trying to rewrite the uri and remove a path before I send the request along to a different than default pool for this virtual server. I will also need to be changing the header but have not gotten that far yet.

 

 

Here is my rule so far:

 

 

when HTTP_REQUEST {

 

if { [HTTP::uri] starts_with "/ImageMetaData/" }{

 

log local0. "matched string"

 

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

 

log local0. "uribefore= [HTTP::uri]"

 

HTTP::uri "substr [HTTP::uri] 14"

 

HTTP::uri "/blahblahblah"

 

log local0. "uriafter= [HTTP::uri]"

 

pool DEV_Image_Access_Service

 

}

 

}

 

 

 

I was not able to get the uri reassignment to happen on the line with the substr. I then decided to just specify a value "/blahblahblah". To my dismay I appear to not be able to assign a value to HTTP::uri. The log file is showing me...

 

 

Jun 13 15:44:08 tmm tmm[864]: Rule Image_Access_Rewrite : matched string

 

Jun 13 15:44:08 tmm tmm[864]: Rule Image_Access_Rewrite : host= dev.systemx.mycompany.net

 

Jun 13 15:44:08 tmm tmm[864]: Rule Image_Access_Rewrite : uribefore= /ImageMetaData/authenticate?appId=spectrum

 

Jun 13 15:44:08 tmm tmm[864]: Rule Image_Access_Rewrite : uriafter= /ImageMetaData/authenticate?appId=spectrum

 

 

Thanks

 

-deon