Context Root Masking/URL Rewrite and pool selection

Once you add an HTTP profile to a VIP, a stream profile will only operate against the HTTP payload (not the HTTP headers). The response doesn't contain a URI exactly. A 30x redirect could contain a URL with the contextroot. You could use 'HTTP::header replace Location $new_value' to do this. Here is an example (Click here).

How many masked URI's are there? You could possibly read the masked URIs from the class and build a stream expression for each one, but I could see it being resource intensive if there are more than a few. Here is a quick example:

  
  when RULE_INIT {  
    
      The prefix to remove  
     set ::uri_prefix "/contextroot"  
    
      A fake datagroup (actually a list) to test with  
     set ::masked_uris [list /uri1 /uri2 /uri3 /uri4]  
    
      Initialize a variable to test with.  
      This would be used to set the stream expression: STREAM::expression $stream_expression  
     set stream_expression ""  
    
      Loop through each element in the "datagroup"  
     foreach uri $::masked_uris {  
    
         Log the current element  
        log local0. "\$uri: $uri"  
    
         Append the current URI to the stream expression  
        set stream_expression "$stream_expression @$::uri_prefix$uri@$uri@"  
    
         Log the current stream expression  
        log local0. "\$stream_expression: $stream_expression"  
     }  
    
      Log the final result for the stream expression  
     log local0. "\$stream_expression: $stream_expression"  
  }  
  

And the log output:

Rule : $uri: /uri1

Rule : $stream_expression: @/contextroot/uri1@/uri1@

Rule : $uri: /uri2

Rule : $stream_expression: @/contextroot/uri1@/uri1@ @/contextroot/uri2@/uri2@

Rule : $uri: /uri3

Rule : $stream_expression: @/contextroot/uri1@/uri1@ @/contextroot/uri2@/uri2@ @/contextroot/uri3@/uri3@

Rule : $uri: /uri4

Rule : $stream_expression: @/contextroot/uri1@/uri1@ @/contextroot/uri2@/uri2@ @/contextroot/uri3@/uri3@ @/contextroot/uri4@/uri4@

Rule : $stream_expression: @/contextroot/uri1@/uri1@ @/contextroot/uri2@/uri2@ @/contextroot/uri3@/uri3@ @/contextroot/uri4@/uri4@

Aaron