Forum Discussion

Anthony's avatar
Anthony
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Sep 27, 2019

TCL error on simple replace header iRule

I'm getting a TCL error from a very simple iRule and cannot understand what scenario would cause it to fail. The iRule does a simple port removal from the host header. when HTTP_REQUEST {    ...
  • Dario_Garrido's avatar
    Dario_Garrido
    Oct 04, 2019

    Try this.

    when HTTP_REQUEST {
   if { [HTTP::host] contains ":" } {
      log local0. "[HTTP::host] becomes [getfield [HTTP::host] {:} 1]"
      HTTP::header replace Host [getfield [HTTP::host] {:} 1]
   }
}

    KR,

    Dario.

Anthony's avatar
Anthony
Icon for Nimbostratus rankNimbostratus

We're running v12.1.4. It only happens every so often so I don't actually know what is causing it. I did wonder if it was something to do with the string replacement. I prefersetting a varaible before the replacement so I'll do that and see if it stops it.

 

Thanks for your answers.

Dario_Garrido's avatar
Dario_Garrido
Icon for MVP rankMVP
Oct 04, 2019

Sure! let us know if it fixes the issue.

 

KR,

Dario.

  • Anthony's avatar
    Anthony
    Icon for Nimbostratus rankNimbostratus
    Oct 04, 2019

    Quick answer is that its generated the same error. 

    TCL error: /Common/remove_port <HTTP_REQUEST> - Operation not supported (line 4)     invoked from within "HTTP::header replace Host $new_host"

    Back to the drawing board...

  • Dario_Garrido's avatar
    Dario_Garrido
    Icon for MVP rankMVP
    Oct 04, 2019

    Try this.

    when HTTP_REQUEST {
   if { [HTTP::host] contains ":" } {
      log local0. "[HTTP::host] becomes [getfield [HTTP::host] {:} 1]"
      HTTP::header replace Host [getfield [HTTP::host] {:} 1]
   }
}

    KR,

    Dario.

  • Anthony's avatar
    Anthony
    Icon for Nimbostratus rankNimbostratus
    Oct 04, 2019

    Thanks Dario, I'll give that a go and see if the errors clear.

  • Anthony's avatar
    Anthony
    Icon for Nimbostratus rankNimbostratus
    Oct 07, 2019

    Not had any TCL errors since putting this one in, so looks like its resolved the issue.

     

    Thanks very much for the suggestion Dario!

     

    Regards,

    Ant