URL rewrite (multiple)

There isn't a host header in responses. If the app uses fully qualified references to itself in response headers (like the Location header in redirects) or in response content (links, forms, etc), you'd need to use a stream profile and iRule to rewrite them.

The proxypass and proxypassv10 iRules (Click here) would allow you to do this type of rewriting. Or for a smaller version, you can try something like the rule below. You'll need to add a blank stream profile to the iRule.

For troubleshooting the rule, you can check the examples on the STREAM::expression wiki page (Click here).

 
 when HTTP_REQUEST { 
  
     Check the host header value (set to lowercase) 
    switch [string tolower [HTTP::host]] { 
       "app1.company.com" { 
           Replace the Host header 
  HTTP::header replace Host "server1.hostname.company.com" 
  
   Save the find/replace strings for responses 
  set internal_host "server1.hostname.company.com" 
  set external_host "app1.company.com" 
       } 
       "app2.company.com" { 
           Replace the Host header 
  HTTP::header replace Host "server2.hostname.company.com" 
  
   Save the find/replace strings for responses 
  set internal_host "server2.hostname.company.com" 
  set external_host "app2.company.com" 
       } 
       default { 
           Take some action for non-matching hosts? 
   In this example we do nothing to responses if there wasn't a match 
  set internal_host "" 
       } 
    } 
     If we're potentially going to rewrite the response headers and/or content 
     prevent the server from sending a compressed response 
    if {$internal_host ne "" && [HTTP::header exists "Accept-Encoding"]}{ 
  
        HTTP::header remove Accept-Encoding 
    } 
 } 
 when HTTP_RESPONSE { 
  
     Disable the stream filter by default 
    STREAM::disable 
  
     Check if we're potentially rewriting this response 
    if {$internal_host ne ""}{ 
  
        Rewrite the Location header for redirects 
       if {[HTTP::is_redirect]}{ 
  
          if {[HTTP::header Location] contains "$internal_hostname"}{ 
             HTTP::header replace Location [string map "$internal_hostname $external_hostname" [HTTP::header Location]] 
  } 
       } 
        Rewrite the response content using a stream profile if it is text 
       if {[HTTP::header Content-Type] contains "text"}{ 
  
           Set the stream expression with the find/replace strings 
          STREAM::expression "@$internal_hostname@$external_hostname@" 
  
           Enable the stream filter 
          STREAM::enable 
       } 
    } 
 } 
 

Aaron