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Forum Discussion

ouch_32572's avatar
ouch_32572
Icon for Nimbostratus rankNimbostratus
Mar 19, 2009

irule to rewrite steam in request

Hi All,   I have an issue that i have manged to resolve on another Lb (zxtm)   I need help translating my rule into an irule for f5.   how do i rewite the stream on an incomming requ...
application delivery
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hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Mar 26, 2009
Hi Garry,

Here is an untested example. Try the first one with logging and if it works, then try the second one. 

 
  when HTTP_REQUEST {  
  
      Check if request is a POST  
     if {[HTTP::method] eq "POST"}{  
  
         Trigger collection for up to 1MB of data  
        if {([HTTP::header exists "Content-Length"]) && ([HTTP::header "Content-Length"] <= 1000000)}{  
   set content_length [HTTP::header "Content-Length"]  
        } else {  
           set content_length 1000000  
        }  
        if { [info exists content_length] } {  
           HTTP::collect $content_length  
        }  
     }  
  }  
  when HTTP_REQUEST_DATA {  
  
      String option to replace https://10.104.30.55 with http://10.104.30.55 in the payload  
     set payload_new [string map "https://10.104.30.55 http://10.104.30.55" [HTTP::payload]]  
  
      Regex option  
      regsub -all "https://10.104.30.55" [HTTP::payload] "http://10.104.30.55" payload_new 
  
      log "[IP::client_addr]:[TCP::client_port]: Replacing payload with new data $payload_new" 
  
       Replace the old payload with the updated one  
      HTTP::payload replace 0 [HTTP::payload length] $payload_new  
  }

Or with fewer intermediate variables: 

  
  when HTTP_REQUEST {  
  
      Check if request is a POST  
     if {[HTTP::method] eq "POST"}{  
  
         Trigger collection for up to 1MB of data  
        if {([HTTP::header exists "Content-Length"]) && ([HTTP::header "Content-Length"] <= 1000000)}{  
   set content_length [HTTP::header "Content-Length"]  
        } else {  
           set content_length 1000000  
        }  
        if { [info exists content_length] } {  
           HTTP::collect $content_length  
        }  
     }  
  }  
  when HTTP_REQUEST_DATA {  
  
       Replace https://... with http://... in the payload  
      HTTP::payload replace 0 [HTTP::payload length] [string map -nocase "https://10.104.30.55 http://10.104.30.55" [HTTP::payload]]  
  }

Aaron