Gerardo_Garcia_
Nimbostratus
NimbostratusURI conditional collecting
We are trying to replace redirects done by meta refresh with proper 302s. We are using the following example:
http://devcentral.f5.com/Wiki/default.aspx/iRules/Replace_HTTP_Refresh_With_HTTP_Redirect.html
However, this only happens during login, and we would like to trim the number of responses that we are collecting and examining for meta tags. One marker is that the request url contains ".pt?"
When we modify the HTTP_RESPONSE to ignore other urls by examining HTTP::uri, we get "command is not valid in current event context".
While I am sure that not being able to determine the uri of the response you are looking at follows all logic and makes perfect sense to the experts, it is rather baffling and frustrating for us first-timers.
We could use some help getting around this. We have poked around the samples, but to no avail. I assume we will need to watch some other event and set a variable, but we are not fluent in iRules and could use a hand.
Below is our current implementation, error and all. We only block chunking if the url has the ".pt?" flag, and are only interested if the content length is between 400 and 600. Else, it is not going to be a meta refresh and there is no need to collect.
Any help is appreciated.
iRule to convert meta refresh statements to 302s
when HTTP_REQUEST {
Don't allow data to be chunked if we are interested in the url.
if { [HTTP::uri] contains ".pt?" } {
if { [HTTP::version] eq "1.1" } {
if { [HTTP::header is_keepalive] } {
HTTP::header replace "Connection" "Keep-Alive"
}
HTTP::version "1.0"
}
}
}
when HTTP_RESPONSE {
grab the response
if { [HTTP::uri] contains ".pt?" } {
if { [HTTP::header exists "Content-Length"] } {
set content_length [HTTP::header "Content-Length"]
if { $content_length > 399 } {
if { $content_length < 601 } {
HTTP::collect $content_length
}
}
}
}
}
when HTTP_RESPONSE_DATA {
look for Meta Refresh
if {[HTTP::payload] contains "meta HTTP-EQUIV=\"REFRESH\" CONTENT=\"0;" }{
look for refresh URL
set urlresponse [findstr [HTTP::payload] "URL=" 4 {">}]
if { $urlresponse != "" } {
pull URL out of URL Tag in Meta Refresh statement
respond with 302
HTTP::respond 302 Location $urlresponse
}
}
}
