Delayed response occured when I changed HTTP response data.

Hi seungho,

 

 

Using a stream profile and STREAM::expression based iRule should be faster and more efficient as you're not having TMM buffer the full payload. See the STREAM::expression wiki page for some examples:

 

 

https://devcentral.f5.com/wiki/iRules.stream__expression.ashx

 

 

 

If for some reason you choose to continue using HTTP::collect, make sure to only collect response payloads if they're ones you want to rewrite (based on content-type starting with text and your content-language being en-US). There's no reason to collect other responses which you aren't going to rewrite.

 

 

Aaron

Thanks for your advice.

 

 

I figured out the reason why the response delayed. It was this code, "HTTP::collect 33000."

 

HTTP_RESPONSE_DATA event called when received data reached 33000 bytes or TIME_OUT.

 

I reduced the collect size to 30000. so, the delayed problem was temporally solved.

 

But it still works in only IE browser.

 

In Chrome, Firefox, Opera browser environment, it doesn't work.

 

 

According to my test,

 

when there is no change in the response data Chrome works,

 

when there is change in the response data Chrome doesn't work.

 

 

Do you know the reason?

 

 

--CUR SOURCE--------------------------------------------------------------------------------------------------------------------

 

when HTTP_RESPONSE {

 

HTTP::collect 30000

 

}

 

 

when HTTP_RESPONSE_DATA {

 

set object [HTTP::payload]

 

set _org "http://ab.cde.ac.kr/webapps/login/"

 

set _new "https://ab.cde.ac.kr/webapps/login/"

 

 

set offset [string first $_org $object 0]

 

if { $offset > 0 } {

 

set len [string length $_org]

 

set last [expr {$offset + $len}]

 

set newobject [string replace $object $offset $last $_new]

 

 

HTTP::payload replace 0 [HTTP::payload length] $newobject

 

}

 

HTTP::release

 

}

 

Hi Aron

 

Thanks for your answer. I'm working with Seungho. I'm updating our status and questions.

 

 

As Seungho wrote already, source was like "SOURCE1".

 

Then,

 

case1. An expected(well changed) response page was displayed on MS-IE soon.

 

-- In all the tests, every response was HTTP 1.0.

 

case2. Nothing appeared on Chrome. At that time, Wireshark captured the full of page contents which I expected.

 

-- Response was HTTP 1.1.

 

case3. If the collection length was less than 27000(not exact number), even Chrome showed perfect page like MS-IE. Captured packets were same whith case 2.

 

-- Response was HTTP 1.1.

 

 

[Question1] Can collect length affect HTTP response phase?

 

 

Based on case2 and case3, I thought, it doesn't matter whether HTTP1.0 or HTTP1.1. Nevertheless, I put several lines changing HTTP request version from 1.1 to 1.0 like SOURCE2.

 

Then,

 

case4. It worked well on MS-IE. Response was HTTP 1.0, same with case1.

 

case5. It worked well on Chromel, too. Even though actual collected response was more than 32000 bytes, no problem. Response was HTTP1.0. (Some decorations in response part were added far later. They didn't exist during case5 tests.)

 

 

[Question2]

 

What does HTTP version have to do with the operation of iRule(HTTP::collect, precisely)? Can you explain the relationship between them?

 

 

[Question3]

 

(This is an extra.) MS-IE client sends HTTP1.1 request. And yet, how come server(or F5) responses in HTTP 1.0 automatically, with no "1.0 pushing" routine.

 

 

 

------ SOURCE 1 ----------------------------------------------

 

when HTTP_RESPONSE {

 

HTTP::collect 30000

 

}

 

 

when HTTP_RESPONSE_DATA {

 

set object [HTTP::payload]

 

set _org "http://ab.cde.ac.kr/webapps/login/"

 

set _new "https://ab.cde.ac.kr/webapps/login/"

 

 

set offset [string first $_org $object 0]

 

if { $offset > 0 } {

 

set len [string length $_org]

 

set last [expr {$offset + $len}]

 

set newobject [string replace $object $offset $last $_new]

 

 

HTTP::payload replace 0 [HTTP::payload length] $newobject

 

}

 

HTTP::release

 

}

 

 

 

 

------ SOURCE 2 ----------------------------------------------

 

when HTTP_REQUEST {

 

if { [HTTP::version] eq "1.1" } {

 

if { [HTTP::header is_keepalive] } {

 

HTTP::header replace "Connection" "Keep-Alive"

 

}

 

HTTP::version "1.0"

 

}

 

}

 

 

when HTTP_RESPONSE {

 

if {[HTTP::header "Content-Type"] contains "text" && [HTTP::header "Content-Language"] contains "en-US"} {

 

if {[HTTP::header exists "Content-Length"] && [HTTP::header "Content-Length"] <= 1048576 } {

 

set col_len [HTTP::header "Content-Length"]

 

}

 

else {

 

set col_len 1048576

 

}

 

HTTP::collect $col_len

 

}

 

}

 

 

when HTTP_RESPONSE_DATA {

 

set object [HTTP::payload]

 

set _org "http://ab.cde.ac.kr/webapps/login/"

 

set _new "https://ab.cde.ac.kr/webapps/login/"

 

 

set offset [string first $_org $object 0]

 

if { $offset > 0 } {

 

set len [string length $_org]

 

set last [expr {$offset + $len}]

 

set newobject [string replace $object $offset $last $_new]

 

 

HTTP::payload replace 0 [HTTP::payload length] $newobject

 

}

 

HTTP::release

 

}