Forum Discussion

Hien_Truong's avatar
Hien_Truong
Icon for Cirrus rankCirrus
Sep 19, 2023

Rewrite the post operation with a body.

Hi; can you help to write the irule to rewrite the post operation (not uri redirect) with a body as below: For example:      abc-cd.ef.com/abc/v1/jurisdict/configuration rewrite to cd.ef.com/abc/v1...
application delivery
devops
  • Hien_Truong's avatar
    Hien_Truong
    Sep 22, 2023

    Hi Kerry/JRalm;

    The issue resolved when i changed pool members from DEX to NGINX (using the same irule) since rewrite host name locate in NGINX. Thanks a lot for your support.

Hien_Truong's avatar
Hien_Truong
Icon for Cirrus rankCirrus
Sep 19, 2023

i tried both of your irules using my browser but i get 404 return. it mean somehow it doesn't hit irule when applying it to F5 then F5 send the request to pool members and get 404 error. i also tried the below irule but still not working. i see "get" method in console. Please advise. Thanks

when HTTP_REQUEST {
if {[HTTP::method] eq "POST"}{
HTTP::header replace origin "http://123.abc.com"
HTTP::header replace referer "http://123.bcd.com"
} else { return }
}

  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Sep 19, 2023

    maybe try the serverside of the connection to update the host?

    when HTTP_REQUEST_SEND {
    clientside {
        HTTP::header replace Host <your desired host for server-side>
    }
}
  • Kerry's avatar
    Kerry
    Icon for Cirrus rankCirrus
    Sep 20, 2023

    if https.   you need to set the SNI values in the SSL profiles or via Irule.   for testing add a log line so you know if the rules it hit and what things are being set to.   also web server logs will show what being passed to it.        there is a few irules examples aroubd on how to log all html headers.  

    "host" is the header you need to changes.    the two you listed are just for reference. 

     

    • Hien_Truong's avatar
      Hien_Truong
      Icon for Cirrus rankCirrus
      Sep 20, 2023

      we don't need SNI since both domain names are in different VS. i tried all of irule samples but allways get 404 from server. From curl -vks https://abc-cd.ef.com output, i don't see the header changed. to cd.ef.com. i will add log line to debug it. Any more advise why the irule or rewrite profile not working to replace other domain? thanks

      • Kerry's avatar
        Kerry
        Icon for Cirrus rankCirrus
        Sep 21, 2023

        F5 has a bug where SNI "server side" is set using the data in the client TCP packet.  thus you migh have to set "server name" in server side SSL profiles.    If you are tring to send to two different servers with different host names.  you might need two SNI server profiles with different "server name" and use a irules to select the correct on. 

        see https://support.f5.com/csp/article/K13452
        see https://support.f5.com/csp/article/K41600007

        i some times use curl on the Ff5 itself to see what the server (pool member) will and will not accpet.    something like "curl -vk --header "Host: change_fqdn" --resolve old_FQDN:443:pool_member https://old_FQDN/"   when this work then you know what to set in the irule.