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BharatSharda's avatar
BharatSharda
Icon for Altostratus rankAltostratus
Apr 08, 2021

Insert text to HTTP header via iRule event during APM execution

Hi Community Members, We are trying to insert some text to HTTP header through an iRule which will check for ACCESS_POLICY_AGENT_EVENT generated by via iRule event during an APM checking. Event "...
application delivery
BIG-IP Access Policy Manager (APM)
iRules
  • spalande's avatar
    spalande
    Apr 14, 2021

    HTTP_REQUEST_SEND is also one of the event can be used to send the APM variable.

    https://support.f5.com/csp/article/K74392192

    so worth trying below. modify as needed.

    when ACCESS_POLICY_AGENT_EVENT {
    if { [ACCESS::policy agent_id] eq "event_1" } {
        ACCESS::session data set session.custom.header "value"
        set header [ACCESS::session data get "session.custom.header"]
    }
 }
 
 when HTTP_REQUEST_SEND  {    
    clientside {
    if {[info exists header]}{ 
	HTTP::header insert "headername" $header
    } else {
	 return
	}
   }	
 }
spalande's avatar
spalande
Icon for Nacreous rankNacreous
Apr 14, 2021

HTTP_REQUEST_SEND is also one of the event can be used to send the APM variable.

https://support.f5.com/csp/article/K74392192

so worth trying below. modify as needed.

when ACCESS_POLICY_AGENT_EVENT {
    if { [ACCESS::policy agent_id] eq "event_1" } {
        ACCESS::session data set session.custom.header "value"
        set header [ACCESS::session data get "session.custom.header"]
    }
 }
 
 when HTTP_REQUEST_SEND  {    
    clientside {
    if {[info exists header]}{ 
	HTTP::header insert "headername" $header
    } else {
	 return
	}
   }	
 }
  • BharatSharda's avatar
    BharatSharda
    Icon for Altostratus rankAltostratus
    Apr 16, 2021
    when ACCESS_POLICY_AGENT_EVENT {
    if { [ACCESS::policy agent_id] eq "event_1" } {
        ACCESS::session data set session.custom.header "1"
    } else {
        ACCESS::session data set session.custom.header "0"
 }
 
 when HTTP_REQUEST_SEND  {    
    clientside {
    set header [ACCESS::session data get "session.custom.header"]
    if { $header }{ 
	HTTP::header insert "headername" $header
    } else {
	 return
	}
   }	
 }

    Hi Sanjay,

    This worked for my case with a little tweak, had to set the $header again in HTTP_REQUEST_SEND to proceed with the HTTP header insertion. Also the log local0. helped a lot. Thank you for your inputs in here. Cheers.

    I traced the HTTP headers by printing then in ltm logs referring to https://support.f5.com/csp/article/K42210592

    when HTTP_REQUEST {
   foreach aHeader [HTTP::header names] {
   log local0. "HTTP Request Headers: $aHeader: [HTTP::header value $aHeader]"
   }
}