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Forum Discussion

Rogerio_Teixeir's avatar
Rogerio_Teixeir
Icon for Nimbostratus rankNimbostratus
Apr 10, 2008

Replace host based on file type

Hi,

 

 

Im trying to creat a irule that replace de hostname (FQDN) based on what fily type is request...

 

 

Like this:

 

 

Based on class images (jpg,gif,png...etc)

 

 

client request for :www.foobar.com/img/nonono.jpg

 

 

replace the hostname

 

 

Server respond: images.foobar.com/img/nonono.jpg

 

 

???

 

 

 

 

Regards,

 

Rogerio
application delivery
dev
devops
iRules

4 Replies

  • Chris_Seymour_1's avatar
    Chris_Seymour_1
    Historic F5 Account
    Apr 10, 2008
    Rogerio,

    If I understand correctly, you want to replace the host www.foobar.com with images.foobar.com.

    For one file type you could do something simple like this: 

    
when HTTP_REQUEST {
    if { [HTTP::path] ends_with ".jpg" } {
      HTTP::redirect "http://images.foobar.com[HTTP::uri]"
    }
   }

    For multiple images types you should use a data group with matchclass for your images like this:

     
class images {
  ".bmp"
  ".gif"
  ".jpg"
  ".pdf"
  ".BMP"
  ".GIF"
  ".JPG"
  ".PDF"
 }
when HTTP_REQUEST {
    if { [matchclass [HTTP::path] ends_with $::images] } {
      HTTP::redirect "http://images.foobar.com[HTTP::uri]"
    }
   }

    Hope this helps.

    Chris
  • Rogerio_Teixeir's avatar
    Rogerio_Teixeir
    Icon for Nimbostratus rankNimbostratus
    Apr 17, 2008
    Hi,

     

     

    I like to do this over HTTP_RESPONSE. This is possible?

     

    And i need to preserve my existing cookies.....

     

     

    Regards,

     

    rogerio
  • Rogerio_Teixeir's avatar
    Rogerio_Teixeir
    Icon for Nimbostratus rankNimbostratus
    Apr 17, 2008
    Hi,

     

     

    Its is possible the rewrite the host address based in "Content Type"?

     

     

    Regards,

     

    Rogerio
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Apr 17, 2008
    Hi Rogerio,

    Something like this?

    
when HTTP_RESPONSE {
    Check if the Content-Type header value matches our criteria
   if {[HTTP::header value Content-Type] contains "somestring"}{
      log local0. "[IP::client_addr]:[TCP::client_port]: Matched the Content-Type check for [HTTP::header value Content-Type]"
       Initialize a variable to save the cookies
      set cookie_string ""
       Loop through each Set-Cookie header.  Save the value to a string, and remove the header.
      while {[HTTP::header exists Set-Cookie]}{
          Append the current Set-Cookie value to the cookie string
         append cookie_string [HTTP::header value Set-Cookie]\;
         log local0. "[IP::client_addr]:[TCP::client_port]: Current \$cookie_string: $cookie_string"
          Delete the current Set-Cookie header
         HTTP::header remove Set-Cookie
      }
       Include the cookies in the 302 response if there were any
      if {[string length $cookie_string]}{
         log local0. "[IP::client_addr]:[TCP::client_port]: Redirecting with cookies to: http://example.com Set-Cookie $cookie_string"
          Send the 302 redirect response with the cookies
         HTTP::respond 302 Location "http://example.com" Set-Cookie $cookie_string
      } else {
         log local0. "[IP::client_addr]:[TCP::client_port]: Redirecting without cookies to: http://example.com"
          Send the 302 redirect response without the Set-Cookie header as there weren't any cookies
         HTTP::respond 302 Location "http://example.com"
      }
   }
}

    I didn't test it, but it passed an iRuler syntax check. If you run into problems with it, check the /var/log/ltm log file for debug output. Make sure to comment out or remove the logging before using the iRule in production.

    Aaron