Removes default IIS headers for a given array of domains

Site-HeaderRemover.irule

#Header Remover iRule
#By: Pierce Fortin ([email protected])
#Checks for domain being requested on HTTP_Request, Sets flag for response rewrite if match 
#If match, It looks for headers and removes them if they exist.
#v1.0 6/19/2018 Initial write


when RULE_INIT 
{
	set static::headerremoveDebugOn 0
}
when CLIENT_ACCEPTED 
{
	set logPrefix "[IP::client_addr]:[TCP::client_port]:headerremove:\[HTTPS\]:\t"
	if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Client accepted" }
}

when HTTP_REQUEST {
	if { $static::headerremoveDebugOn } { log local0. "$logPrefix: ### Begin processing Incoming" }
	set isheaderremoveDomain 0
    array set headerremoveDomains 
    {
        "domain.com" 
        "domain2.com"
    }
    foreach domain [array get headerremoveDomains]
    {
		if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Checking [HTTP::host] against $domain" }
        if { [string tolower [HTTP::host]] eq [string tolower $domain] } {
			if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Current request is an headerremove domain. Processing" }
        	set isheaderremoveDomain 1
   		}
	}
}

when HTTP_RESPONSE {
	if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Processing Response" }
    if { $isheaderremoveDomain eq 1 } {
    	if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Current request is an headerremove domain. Inserting headerremove" }
        if { ([HTTP::header exists "X-Powered-By"])}{
            if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Found X-Powered-By, Removing" }
            HTTP::header remove X-Powered-By
        }   
        if { ([HTTP::header exists "X-AspNet-Version"])}{
            if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Found X-AspNet-Version, Removing" }
            HTTP::header remove X-AspNet-Version
        }           
        if { ([HTTP::header exists "X-AspNetMvc-Version"])}{
            if { $static::headerremoveDebugOn } { log local0. "$logPrefix: FoundX-AspNetMvc-Version, Removing" }
            HTTP::header remove X-AspNetMvc-Version
        }
        if { ([HTTP::header exists "Server"])}{
            if { $static::headerremoveDebugOn } { log local0. "$logPrefix: Found Server, Removing" }
            HTTP::header remove Server
        }
	}
}