Changing HTTP Header Host port

Hi there,

You can strip out anything after the : in the host header using the getfield command (Click here) or using scan in an iRule:

  
  when HTTP_REQUEST {  
    
      Replace host header value with everything before the colon  
     HTTP::header replace Host "[getfield [HTTP::host] : 1]"  
    
     log local0. "[IP::client_addr]:[TCP::client_port]: Replace original host [HTTP::host] with [getfield [HTTP::host] : 1]"  
  }  
  

If the requests won't always have a port, you could check to see if the host header value contains a colon before replacing the value.

  
  when HTTP_REQUEST {  
    
      Check if host value has a colon  
     if {[HTTP::host] contains ":"}{  
    
         Replace host header value with everything before the colon  
        HTTP::header replace Host "[getfield [HTTP::host] : 1]"  
    
     log local0. "[IP::client_addr]:[TCP::client_port]: Replace original host [HTTP::host] with [getfield [HTTP::host] : 1]"  
     }  
  }  
  

Here is an example using scan (Click here😞

  
  when HTTP_REQUEST {  
    
      Scan the host header value. Save the results to $host and $port if there is a colon in the header value  
     if {[scan [HTTP::host] {%[a-zA-Z_.-]:%d} host port] == 2}{  
    
        HTTP::header replace Host $host  
     }  
  }  
  

I'm not sure whether scan would be more efficient than getfield. You could use the timing command to test this:

Timing command Click here, Timing article Click here

Aaron