Forum Discussion

Emad's avatar
Emad
Icon for Cirrostratus rankCirrostratus
May 14, 2015

Why Irules add Server Header in HTTP::respond and HTTP::redirect

As observed when ever I use HTTP::respond or HTTP::redirect for 302, LTM add server header in response i.e Server: BigIP. Is this a standard behavior and could this be changed. For Example Irule is. 

    when HTTP_REQUEST {
                HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
       }

And response is 

(Status-Line)   HTTP/1.0 302 Found
    Location        https://www.abc.com/
    Server      BigIP
    Connection      Keep-Alive
    Content-Length      0
application delivery
devops
iRules
  • Patrik_Jonsson's avatar
    Patrik_Jonsson
    Icon for MVP rankMVP
    May 14, 2015

    I believe it's there to make the troubleshooting easier and it might even be a standard since other web servers does this as well (IIS, Apache, Tomcat etc) You can probably remove it in the HTTP_RESPONSE event.

    Untested iRule: 

    when HTTP_REQUEST {
    HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
}


when HTTP_RESPONSE {

    if { [HTTP::is_redirect] && [HTTP::header value "Server"] == "BigIP" } {
        HTTP::header remove Server
    }

}

    /Patrik

  • sfuerst_116779's avatar
    sfuerst_116779
    Historic F5 Account
    May 14, 2015

    You can also change the Server-Agent-Name in the http profile to another string. (i.e. to match what your back-end webserver sends.) If the string is empty, then no server header will be added.

     

    This will affect all ways the BigIP will generate responses, not just iRules.