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David_Stephenso's avatar
David_Stephenso
Icon for Nimbostratus rankNimbostratus
Jun 13, 2012

Problems with a rewrite. Please help

Hi, I've been asked to write an irule that will intercept anything with a uri that begins with /upload and remove the /upload.

 

Also, the rule needs to rewrite the host from whatever it is to be the hostname of the server in the pool that it gets served by and to also have :8080 added to it.

 

 

 

https://images.blah.com/upload/document-delivery/uploadfile

 

 

to be rewritten to

 

 

http://hostname:8080/document-delivery/uploadfile

 

 

 

So far I have come up with this:

 

 

 

when HTTP_REQUEST {

 

set origuri [HTTP::uri]

 

if { $origuri starts_with "/upload" } {

 

HTTP::uri [string range $origuri 7 end]

 

pool pool1

 

}

 

}

 

 

 

 

which I thought would at least remove the /upload part of the URI but it doesn't seem to.

 

 

 

Any help is greatly appreciated.

 

 

 

 

 

 

application delivery
dev
devops
iRules

1 Reply

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 13, 2012
    Hi David,

    Here's an example which rewrites the host header value based on the selected server IP address:

    https://devcentral.f5.com/wiki/iRules.rewrite_host_header_to_server_name.ashx

    You could modify that to change the URI as you need to. In pre-v11, the [HTTP::uri] value is cached within the same event. The actual value sent to the pool is updated though. If you want to log the updated value, you can do this in a later HTTP_REQUEST event: 

    when HTTP_REQUEST {
   log local0. "[IP::client_addr]:[TCP::client_port]: Original request: [HTTP::host][HTTP::uri]"
   if { [HTTP::uri] starts_with "/upload" } {
      HTTP::uri [string range [HTTP::uri] 7 end]
      pool pool1
   }
}
when HTTP_REQUEST priority 501 {
   log local0. "[IP::client_addr]:[TCP::client_port]: Current request: [HTTP::host][HTTP::uri]"
}

    Aaron