Forum Discussion
NimbostratusHTTP::collect does not function as expected
iRule written below does not collect the specified amount (1024 Bytes) of payload data. Am I missing something here? When I debug the payload contents, the chunked payload size amounts to only about 869 Bytes, while the specified content_length is 1024 Bytes. The size of the actual length is around 2.55 KB, lager than the specified length.
The HTTP::method is POST
BIG-IP LTM 1600
TMOS 12.1.0
when HTTP_REQUEST {
if { [HTTP::host] contains "test-main" } {
pool pool_test-main
return
} elseif { [HTTP::host] contains "test01" } {
pool pool_test01
return
} else {
pool pool_test02
if {[HTTP::uri] contains "web_dummy"} {
if {[HTTP::header "Content-Length"] ne "" && [HTTP::header "Content-Length"] <= 1024}{
set content_length [HTTP::header "Content-Length"]
} else {
set content_length 1024
}
collect
HTTP::collect $content_length
}
return
}
}
when HTTP_REQUEST_DATA {
log local0. "collected data.....POST Data: [HTTP::payload]"
foreach x [split [HTTP::payload] "&"] {
if { $x starts_with "user_ref=" } {
set user_ref [lindex [split $x "="] 1]
if { [matchclass $user_ref equals CX_SERVICE_ID] }{
HTTP::uri [string map {"/web_dummy" "/notify_dummy"} [HTTP::uri]]
pool pool_test00
return
}
}
}
return
}
youssef1Cumulonimbus
Hi,
I think that your behaviour is correct. let me explain.
When you specify 1024 Bytes, F5 will collects the amount of data that you specify. If the specified amount of data exceeds the amount in the Content-Length response header, only the smaller amount will be collected.
https://devcentral.f5.com/wiki/iRules.HTTP__collect.ashx
So If your request is chunked F5 will collexts only the smaller amount so 869 bytes.
For information, Chunking is a concept introduced in HTTP/1.1 in order to reduce the amount of local storage required on the web server for sending responses.
So in your case if you want to see collect data to 1024 bytes you have to Force the server to HTTP/v1.0 prevents chunking...
The following example includes collection counter / recollect logic to process payloads > 1MB in size. (Untested, may not be optimal -- please update with improvements.) when HTTP_REQUEST { Don't allow data to be chunked if { [HTTP::version] eq "1.1" } { if { [HTTP::header is_keepalive] } { HTTP::header replace "Connection" "Keep-Alive" } HTTP::version "1.0" } set collected 0 }https://devcentral.f5.com/questions/request-response-chunking
Keep me update please.
Regards
RaghavendraSY_7Try with any one of below code:
set content_length 1048576 (Example for 1MB)
or
set max_content_length = 524288 (Example for 512KB)
and then call content length in your code.
rsacheenThank you for the response. I want to collect 1KB, but the actual collected payload data is only about 870Bytes.
set content_length 1024
RaghavendraSYAltostratus
Try with any one of below code:
set content_length 1048576 (Example for 1MB)
or
set max_content_length = 524288 (Example for 512KB)
and then call content length in your code.
- rsacheen
Thank you for the response. I want to collect 1KB, but the actual collected payload data is only about 870Bytes.
set content_length 1024