Forum Discussion

Cirrus

Oct 17, 2022

Rewrite Subdomain

Dears, I am wondering about an efficient procedure to search and replace a specific Subdomain in the HOST, What i want to achieve is rewrite the HTTP request toward the server side as follows: Clie...

application delivery

CA_Valli

Oct 17, 2022

Code above is case sensitive on HTTP::host match.

If you want a case-insensitive match you can run this instead

when HTTP_REQUEST {
#    log local0. "Client requested host: [HTTP::host]"
  if { [string tolower [HTTP::host]] starts_with "dir" && [string tolower [HTTP::host]] contains "clust1" }{
    HTTP::header replace Host [string map {"clust1" "clust2"}[string tolower [HTTP::host]]]
#        log local0. "Modified host: [HTTP::host]"
  }
}

Oct 17 15:43:07 bigip info tmm7[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Client requested host: DIR000.Clust1.Domain.com
Oct 17 15:43:07 bigip info tmm7[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Modified host: dir000.clust2.domain.com

CA_Valli

MVP

when HTTP_REQUEST {
  if { [HTTP::host] starts_with "DIR" && [HTTP::host] contains "Clust1" }{
  HTTP::header replace Host [string map {"Clust1" "Clust2"}[HTTP::host]]
  }
}

Sample execution logs:

Oct 17 15:32:37 bigip info tmm[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Client requested host: DIRx.Clust1.Domain.com
Oct 17 15:32:37 bigip info tmm[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Modified host: DIRx.Clust2.Domain.com
Oct 17 15:32:41 bigip info tmm6[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Client requested host: DIRy.Clust1.Domain.com
Oct 17 15:32:41 bigip info tmm6[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Modified host: DIRy.Clust2.Domain.com
Oct 17 15:32:43 bigip info tmm6[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Client requested host: DIRz.Clust1.Domain.com
Oct 17 15:32:43 bigip info tmm6[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Modified host: DIRz.Clust2.Domain.com

CA_Valli

MVP

Oct 17, 2022

Code above is case sensitive on HTTP::host match.

If you want a case-insensitive match you can run this instead

when HTTP_REQUEST {
#    log local0. "Client requested host: [HTTP::host]"
  if { [string tolower [HTTP::host]] starts_with "dir" && [string tolower [HTTP::host]] contains "clust1" }{
    HTTP::header replace Host [string map {"clust1" "clust2"}[string tolower [HTTP::host]]]
#        log local0. "Modified host: [HTTP::host]"
  }
}

Oct 17 15:43:07 bigip info tmm7[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Client requested host: DIR000.Clust1.Domain.com
Oct 17 15:43:07 bigip info tmm7[11345]: Rule /Common/test-iRule <HTTP_REQUEST>: Modified host: dir000.clust2.domain.com

Muhannad
Cirrus
Oct 19, 2022
This is working perfectly thanks :).
LiefZimmerman
Admin
Oct 25, 2022
"Working perfectly!" so good.

And...if I'm reading this right... CA_Valli - you had this solution in place only 2hrs after Muhannad asked? and in the middle of the night (for me on the west coast of US)?

Thank you for your perfection & speed!
⏩🚀
- CA_Valli
  MVP
  Oct 26, 2022
  LiefZimmerman I'm based in europe so I was well awake and coffe-fueled 😉
- Muhannad
  Cirrus
  Oct 26, 2022
  LiefZimmerman to be honest, the Devcentral is an added value when i am looking for solutions, all the creidts goes to CA_Valli in this case.