URL Rewrite without Redirect

For details on the various HTTP:: commands you can check the iRule wiki page:

 

HTTP:: (Click here)

 

 

For a given URL of http://www.example.com:80/path/to/file.ext?param1=value1, you can use the following commands to get/set the values:

 

 

HTTP::host - get the host header value (www.example.com:80)

 

HTTP::header replace Host "newhost.example.com" - set a new host header value

 

HTTP::uri - get/set the URI (path plus query string: /path/to/file.ext?param1=value1)

 

HTTP::path - get/set the path (URI minus query string: /path/to/file.ext)

 

HTTP::query - get the query string (URI minus the path: param1=value1)

 

 

If you don't need the full functionality of the ProxyPass iRule, you can do something like this:

 

 

  
 when HTTP_REQUEST {  
  
     Log a debug line on each request 
    log local0. "[IP::client_addr]:[TCP::client_port]: New request to [HTTP::host][HTTP::uri]" 
  
     Check if the host/path starts with the following string  
    if {("[string tolower [HTTP::host]][HTTP::path]" starts_with "webservice.xxx.xx/webservice/")}{   
  
        Replace the host header  
       HTTP::header replace Host "ihstestweb.xxx.xx:1234"  
  
        Log a debug line on each Host rewrite 
       log local0. "[IP::client_addr]:[TCP::client_port]: Rewrote Host header from [HTTP::host] to ihstestweb.xxx.xx:1234" 
    }  
 }  
 

 

 

You may also need to rewrite redirects coming from the application if they contain the internal hostname. If so, you can add this event code:

 

 

  
 when HTTP_RESPONSE {  
  
     Replace the internal hostname in the HTTP Location header value in redirects  
    if {[HTTP::is_redirect]}{  
  
       log local0. "[IP::client_addr]:[TCP::client_port]: Rewriting redirect from [HTTP::header value Location] to\ 
          [string map {ihstestweb.xxx.xx:1234 webservice.xxx.xx}] [HTTP::header value Location]]" 
  
       HTTP::header value Location [string map {ihstestweb.xxx.xx:1234 webservice.xxx.xx}] [HTTP::header value Location]]  
    }  
 }  
 

 

 

If you only want to replace the host in redirects if the location starts with webservice, you can replace the HTTP::is_redirect check with this:

 

 

  
 when HTTP_RESPONSE {  
  
     Replace the internal hostname in the HTTP Location header value in redirects  
    if {[HTTP::is_redirect] && [HTTP::header value "Location"] contains "ihstestweb.xxx.xx:1234/webservice"}{  
  
       log local0. "[IP::client_addr]:[TCP::client_port]: Rewriting redirect from [HTTP::header value Location] to\ 
          [string map {ihstestweb.xxx.xx:1234 webservice.xxx.xx}] [HTTP::header value Location]]" 
  
       HTTP::header value Location [string map {ihstestweb.xxx.xx:1234 webservice.xxx.xx}] [HTTP::header value Location]]  
    }  
 }  
 

 

 

If you need to replace the internal hostname within the page content, you can add a stream profile and use the STREAM::expression and STREAM::enable commands to do this. Check the STREAM::expression wiki page (Click here) for details.

 

 

Aaron