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gerhackett's avatar
gerhackett
Icon for Nimbostratus rankNimbostratus
Oct 13, 2020

iRule to examine response HTML for image URLs

Hi,   I'd like to write an iRule to scan a HTML response body for image tags and store all of the source URLs in a table. I understand that once I've fired a HTTP::collect in a HTTP_REQUEST event...
application delivery
iRules
Dario_Garrido's avatar
Dario_Garrido
Icon for MVP rankMVP
Oct 19, 2020

Hello Gerhackett.

After collecting the HTTP payload, you can do something like this.

when HTTP_RESPONSE_DATA {
	set find "https?://.*.jpg"
	set indices [regexp -all -indices -inline $find [HTTP::payload]]
 
	foreach idx $indices {
		set start [ expr { [lindex $idx 0] } ]
		set end [expr { [lindex $idx 1] } ]
		log local0. "[substr [HTTP::payload] $start $end]"
	}
}

Modify the regex properly to match your goal. You can test your regex here:

https://regex101.com/

Regards,

Dario.