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Spencer_Aranda's avatar
Spencer_Aranda
Icon for Altocumulus rankAltocumulus
Nov 18, 2022

Help deleting header name that contains curly braces

Hi Just a quick question.  I was asked to use the F5 to remove a header name as follows {esbsoapheader}userName The header value was just fine.  But I was asked to remove {esbsoapheader} from heade...
application delivery
  • Spencer_Aranda's avatar
    Spencer_Aranda
    Nov 18, 2022

    I think I just figured it out guys Mohamed_Ahmed_Kansoh  CA_Valli 

    Paste this and run it.  It worked out for me.  Now any of you can explain why this works??  Is this a bug with F5?  At least it seems to me.  If it is, how can I let them know so they can fix it.

    when HTTP_REQUEST {
  if { [HTTP::uri] eq "/demo2" } {
    HTTP::header insert "{esbsoapheader}userName" "spencer"
    foreach aHeader [HTTP::header names] {
      log local0. "HTTP Request Headers: $aHeader: [HTTP::header value $aHeader]"
    }
    log local0. "***************REMOVING BAD HEADER************"
    HTTP::header remove "\\{esbsoapheader\\}userName"
    foreach aHeader [HTTP::header names] {
      log local0. "HTTP Request Headers: $aHeader: [HTTP::header value $aHeader]"
    }
  }
}
CA_Valli's avatar
CA_Valli
Icon for MVP rankMVP

Hello, I'd love to help you out but this is turning out to be tricky.

It's not possible to edit header name directly via iRule, so my code retrieves {esbsoapheader}userName value and inputs it into a new userName header. Then I'm attempting to delete {esbsoapheader}userName -- but this fails. I see iRule execution crashes and cllient connection is reset. 

I've tried escaping curly braces with "\" as well, or passing it via a variable, but it doesn't seem to work. 

Will it be enough to just insert userName? Is it a problem if {esbsoapheader}userName exists in request? 

Sharing my progress so far. 

when HTTP_REQUEST {
  if { [HTTP::header exists "{esbsoapheader}userName"] }{ 
       HTTP::header insert userName [HTTP::header "{esbsoapheader}userName"]
# non-working code
#       HTTP::header remove "{esbsoapheader}userName"
#       HTTP::header remove "\{esbsoapheader\}userName"
#       HTTP::header remove \{esbsoapheader\}userName
#       set hnme "{esbsoapheader}userName" ;  HTTP::header remove $hname     
  }
}

 

Spencer_Aranda's avatar
Spencer_Aranda
Icon for Altocumulus rankAltocumulus
Nov 18, 2022

Thank you for taking the time to look into this CA_Valli 

What you just showed to me is the fix that I gave the people that first asked me to remove {esbsoapheader} from header name. 

I ended up just inserting a new header name just with userName and did not remove the bad header name.  However, this is not quite what they were looking for so that is why I came to the F5 forum to look for answers.  

I'm extremely curious how it worked out for Mohamed_Ahmed_Kansoh  ...