Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Dec 06, 2023

Reading chunked data in iRule

Hey, I have an iRule in which I read all the payloads in each request and response. When there iRule receives chunked data, because there is no content-length I just use some big number as a limit...
devops
GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Dec 13, 2023
Splitting my reply to a few messages, because it didn't let me reply saying I was "Post Flooding".
Thanks for the reply.
This is sort of what I'm trying to do.
I have a simple iRule to start with where I'm trying to log the whole payload (all chunks combined) at the end of the response, while allowing the VS to send each chunk back to the client instead of buffering it.
GuyG's avatar
GuyG
Icon for Altocumulus rankAltocumulus
Dec 13, 2023
when HTTP_RESPONSE {
    log local0.debug "Start of HTTP_RESPONSE"
    set readSoFar 0
    catch { HTTP::collect 1 }
}

when HTTP_RESPONSE_DATA {
    log local0.debug "Start of HTTP_RESPONSE_DATA"

    set prev_readSoFar $readSoFar
    set readSoFar [HTTP::payload length]
    log local0.debug "readSoFar: |$readSoFar|, prev_readSoFar: |$prev_readSoFar|"
    
    if { $readSoFar == $prev_readSoFar } {
        log local0.debug "Whole body: |[HTTP::payload]|"
    } else {
        HTTP::release

        catch { HTTP::collect [expr {$readSoFar + 1}] }
    }
}

when HTTP_RESPONSE_RELEASE {
    log local0.debug "Start of HTTP_RESPONSE_RELEASE"
}