HTTPS offload rewriting

Problem this snippet solves:

This iRule shows how to rewrite an HTTP web application's self references from http:// to https:// to avoid insecure content warnings.

Note if the response content size is changed like it would be with this iRule you must use a custom HTTP profile with response chunking set to rechunk.

Code :

when HTTP_REQUEST {

# Save the requested host value
set host [string tolower [HTTP::host]]

# If the HTTP host header is blank, use the VS IP address
# If the VS IP is not routable for clients, hard code a routable IP
# to replace [IP::local_addr]
if {$host eq ""}{set host [IP::local_addr]}

# Disable the stream filter by default
STREAM::disable
}
when HTTP_RESPONSE {

# Check if response type is text and host isn't null
if {[HTTP::header value Content-Type] contains "text" and $host ne ""}{

# Replace http://$host with https://$host
STREAM::expression "@http://$host@https://$host@"

# Enable the stream filter for this response only
STREAM::enable

}
# Rewrite the Location header in redirects to https://
if { [HTTP::is_redirect] && [string tolower [HTTP::header Location]] starts_with "http://$host"} {
HTTP::header replace Location [string map -nocase "http://$host https://$host" [HTTP::header Location]]
}
}