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Aj2's avatar
Aj2
Icon for Altostratus rankAltostratus
Jan 08, 2024

Need Help in iRule to Modify HTTP header parameter.

I need to Write iRule where I want to change the HTTP header parameter from

  1. sname to Sname
  2. uaccount to Uaccount
HTTP Header
POST /URI PATH/ HTTP/1.1\r\n
sname : BEVI9999\r\n
uaccount : \r\n
\r\n


is it correct iRule

when HTTP_REQUEST {
  HTTP::header replace sname SName
  HTTP::header replace uaccount UAccount
}

expected output

HTTP Header
POST /URI PATH/ HTTP/1.1\r\n
SName: BEVI9999\r\n
UAccount: \r\n
\r\n

Above iRule is correct for the requirement?

application delivery
irule
security
  • Lucas_Thompson's avatar
    Lucas_Thompson
    Jan 08, 2024

    HTTP headers are not case sensitve in correctly implemented HTTP servers (see https://www.rfc-editor.org/rfc/rfc9110.html#name-field-names) , so the BIG-IP iRule command to handle them is also case insensitive (https://clouddocs.f5.com/api/irules/HTTP__header.html).

    You'll have to first grab the header names (with any case), delete the headers (with any case), then re-add new headers (with your desired case). Something like this should work:

    when HTTP_REQUEST {
      set sname [HTTP::header value sname]
      set uaccount [HTTP::header value uaccount]

      HTTP::header remove sname
      HTTP::header remove uaccount

      HTTP::header replace SName $sname
      HTTP::header replace UAccount $uaccount
    }