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From: Karthik Nanjangude <karthik.nanjangude@xius-bcgi.com>
To: Tomcat Users List <users@tomcat.apache.org>
Date: Tue, 10 Aug 2010 17:46:18 +0530
Subject: RE: 2 POST requests to underlying Server
Thread-Topic: 2 POST requests to underlying Server
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Hi

>> Have you really traced the browser -> server side to see if the duplicat=
e POST request

As I have already said by using the TCP Thread dump using command
  "tcpdump -i bond0 -s 1500 -w / tmp / test.pcap "

We are clearly able to see the IP Address of Apache written 2 times  POST f=
or the JBOSS ( Tomcat built in) being called with in 12 seconds apart.

We also made sure there is no traffic /users using the web application duri=
ng the tcp dump taken.


>> Are they really the same, from the same client, with the same content

For simple test case we used 1 simple transaction Page  to do the activity
For insertion, but the since 2 request to web server ,we see 2 rows inserte=
d in DB

This has happened in spite of blocking multiple button clicks on jsp page u=
sing jscript filter.


>> claim that Apache or mod_jk or Tomcat duplicates a POST

My Observation as per TCP dump command, we clearly see multiple request bei=
ng sent from Apache to web server.


With regards
KArthik


-----Original Message-----
From: Andr=E9 Warnier [mailto:aw@ice-sa.com]
Sent: Tuesday, August 10, 2010 4:48 PM
To: Tomcat Users List
Subject: Re: 2 POST requests to underlying Server

Karthik Nanjangude wrote:
> Hi
>
>>> (*) do you have any particular reason to use this setting, instead of t=
he default ? Or is
> it just something you copied from some blog page ?
>
>
> 1) I have not copied the same from  any Blog , it is as defined
>    configuration  as is from the N/w team
>
> 2) Where can I fine the default settings for the same ?

In the on-line documentation, at
http://tomcat.apache.org/connectors-doc/reference/workers.html

>
>
> 3) As I have already said We have put a Java script filter to disable
>    multiple Clicks for dual request from the Browser ( IE 7+ / FF 3+ )
>

Well, maybe it is not working.  Have you really traced the browser -> serve=
r side to see
if the duplicate POST request originates there ?

Plus, in your original message, you do not define very clearly what these 2=
 POST requests
are.  Are they really the same, from the same client, with the same content=
 ? how close to
one another do they arrive ?

If it was mod_jk resending the same request after the socket_timeout of 10 =
s, then the 2
POST requests should be separated by at least 10 s.  Are they ?

As someone once said : Extraordinary claims require extraordinary proof.

In other words : you seem to claim that Apache or mod_jk or Tomcat duplicat=
es a POST
request.  This is not the behaviour experienced by the vast majority of Apa=
che + mod_jk +
Tomcat installations.  So you need data a bit more solid than what you have=
 supplied so
far, before someone will believe that there is another reason than the user=
 clicking twice.


>
>
>
>
> With regards
> karthik
>
>
>
> -----Original Message-----
> From: Andr=E9 Warnier [mailto:aw@ice-sa.com]
> Sent: Tuesday, August 10, 2010 4:10 PM
> To: Tomcat Users List
> Subject: Re: 2 POST requests to underlying Server
>
> Karthik Nanjangude wrote:
>> Hi
>>
>> Spec
>> Java 1.5
>> O/s : Linux
>> APP Server        :  JBOSS4.2.1 (Tomcat built with)
>> HTTP Server      :  apache_2.2.11 [ With out SSL ]
>> Mod library        :  mod_jk-1.2.28-httpd-2.2.X.so
>> LB  1 Apache     :  1 JBOSS:Port of application
>>
>>
>> Question :  Some times We have observed that  on WEB Application  ( clic=
k on  button in jsp )
>>                  Apache is sending 2 POST requests to underlying JBOSS (=
 Tomcat server ).
>>
>> Note: We even put a Java script filter to disable multiple Clicks for th=
e page,
>>
>>
>> How we Observed :  Via TCP Thread dump using command    "tcpdump -i bond=
0 -s 1500 -w / tmp / test.pcap "
>>
>>
>> Can this configuration "worker.node1.socket_timeout=3D10" got any thing =
to do with this multiple request activity?
>>
> Unlikely, but :
>
> 1) simple test : remove this setting, and see if the issue still appears =
 (*)
> (By removing the setting, you make the timeout infinite)
>
> 2) use the mod_jk logging level TRACE, to see exactly what mod_jk is send=
ing to Tomcat
>
> 3) It is unlikely that any Apache or mod_jk or Tomcat component would rep=
eat a POST
> request, because that kind of violates the HTTP RFC.  So chances are, tha=
t the double POST
> request is /still/ coming from the browser.
>
>
> (*) do you have any particular reason to use this setting, instead of the=
 default ? Or is
> it just something you copied from some blog page ?
>
>
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