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Posted to users@tomcat.apache.org by "Dmitri O.Kondratiev" <do...@gmail.com> on 2009/06/21 21:34:49 UTC
Apache Load Balancer - truncating responses?
Hello!
I have the following problem:
When using apache load balancer with Tomcat, *sometimes* responses get
truncated , resulting in incomplete HTML of *wrong* encoding. My application
that Tomcat runs always returns responses in utf-8, yet when truncated, page
has a different encoding.
The following combinations work:
1) IE -> Tomcat
2) IE -> Load Balancer -> Tomcat
3) WebLoad -> Tomcat
The following returns truncated HTML:
1) WebLoad -> Load Balancer -> Tomcat
Could Apache content negotiation be the reason for this error?
Any other ideas why this could happen?
Thanks!
Dmitri.
RE: Apache Load Balancer - truncating responses?
Posted by Martin Gainty <mg...@hotmail.com>.
i can investigate if you can send me the configuration files you are using for Apache
httpd.conf,workers.properties,.htaccess, mime.types,magic.default
Tribes:
$TRIBES_HOME/org/apache/catalina/tribes/mbeans-descriptors.xml
$TRIBES_HOME/org/apache/catalina/tribes/membership/mbeans-descriptors.xml
$TRIBES_HOME/org/apache/catalina/tribes/transport/mbeans-descriptors.xml
LocalStrings.properties
Mit freundlichen Grüßen
Martin
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> Date: Sun, 21 Jun 2009 23:14:10 +0200
> From: aw@ice-sa.com
> To: users@tomcat.apache.org
> Subject: Re: Apache Load Balancer - truncating responses?
>
> Dmitri O.Kondratiev wrote:
> > Hello!
> > I have the following problem:
> > When using apache load balancer with Tomcat, *sometimes* responses get
> > truncated , resulting in incomplete HTML of *wrong* encoding. My application
> > that Tomcat runs always returns responses in utf-8, yet when truncated, page
> > has a different encoding.
> >
> > The following combinations work:
> > 1) IE -> Tomcat
> > 2) IE -> Load Balancer -> Tomcat
> > 3) WebLoad -> Tomcat
> >
> > The following returns truncated HTML:
> > 1) WebLoad -> Load Balancer -> Tomcat
> >
> > Could Apache content negotiation be the reason for this error?
> > Any other ideas why this could happen?
> >
> Hi.
> I can't answer, but just to save time for someone else who would like to
> help you, could you specify :
> - what platforms is (are) this ?
> - what versions of Apache and Tomcat ?
> - what do you use to connect Apache and Tomcat (mod_proxy_http,
> mod_proxy_ajp, mod_jk, other ?)
> - is Apache httpd configured to do any kind of caching ?
> - what is "WebLoad" ?
> - what do you mean by "page has a different encoding" ? How do you know
> that ? Is the HTTP response "Content-type" header different ? Is a
> <meta> tag in the page different ?
>
> (If you do not know the answer to that, search in Google for "Fiddler2".
> That is an add-on for IE, which allows you to see exactly what
> requests go from IE -> server, and the responses that go server -> IE.
> Including the HTTP headers, body etc..).
>
> Also, to stop you maybe looking in the wrong place, I believe that
> Apache content negociation only happens when you specify it explicitly,
> and it should only happen for content that Apache itself can serve
> locally, not for anything that is proxied somewhere else.
>
> Also, since according to your data below, it seems to be working fine in
> Tomcat itself, and not working fine when Apache httpd is in front of it,
> you may want to post this to the Apache httpd users list.
>
>
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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Re: Apache Load Balancer - truncating responses?
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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André,
On 6/22/2009 10:58 AM, André Warnier wrote:
> In the "log.txt", I see that the first browser request is a POST.
> The response to that is a 302 moved, with a new location.
> OK so far.
> But then, when the browser re-issues the request to the new location, it
> does a GET, not a POST.
This is common (client) reaction to a 302 response. Response codes 303
and 307 were invented to standardize the behavior of web browsers that
support such codes. Unfortunately, the fear of older browsers being used
has pretty much kept applications issuing 302 responses instead of the
(better, IMO) 303 and 307 response codes. So, the spec has improved but
the web hasn't so much. :(
Nice analysis of the response, André.
- -chris
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Re: Apache Load Balancer - truncating responses?
Posted by André Warnier <aw...@ice-sa.com>.
Hi Dmitri.
No need to copy me personally. I am subscribed to the forum, so I get
these messages anyway.
A very quick look at the files you posted shows the following thing that
I personally find strange :
In the "log.txt", I see that the first browser request is a POST.
The response to that is a 302 moved, with a new location.
OK so far.
But then, when the browser re-issues the request to the new location, it
does a GET, not a POST.
I am not sure this has to do with the issue, but did you try this with
another browser, and does it do the same ?
Apart from that :
The response seems indeed truncated, after 16632 bytes. The last byte is
a \xD1, which is invalid UTF-8.
The rest until then is entirely valid UTF-8, also with the correct HTTP
header :
content-type: text/html;charset=UTF-8
So I think that you do not really have a "wrong encoding" of the
response. It is properly encoded. The fact that it appears wrongly
encoded is probably just an artifact of IE, who (rightly) never sees the
proper closing tags of the document, and consequently loses its mind
somehow.
I have tried to open the saved page with Firefox (after renaming it to
.html), and it does show an incomplete page, but it shows it in Russian
(I guess) cyrillic characters. So it does understand the encoding.
All of that to say that :
- first you should find out about the POST/GET above
- then you should try another browser
- and finally, the problem seems to be indeed a truncation of the
result. Now remains to find out why this happens..
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Re: Apache Load Balancer - truncating responses?
Posted by "Dmitri O.Kondratiev" <do...@gmail.com>.
On Mon, Jun 22, 2009 at 1:14 AM, André Warnier <aw...@ice-sa.com> wrote:
> Dmitri O.Kondratiev wrote:
>
>> Hello!
>> I have the following problem:
>> When using apache load balancer with Tomcat, *sometimes* responses get
>> truncated , resulting in incomplete HTML of *wrong* encoding. My
>> application
>> that Tomcat runs always returns responses in utf-8, yet when truncated,
>> page
>> has a different encoding.
>>
>> The following combinations work:
>> 1) IE -> Tomcat
>> 2) IE -> Load Balancer -> Tomcat
>> 3) WebLoad -> Tomcat
>>
>> The following returns truncated HTML:
>> 1) WebLoad -> Load Balancer -> Tomcat
>>
>> Could Apache content negotiation be the reason for this error?
>> Any other ideas why this could happen?
>>
>> Hi.
> I can't answer, but just to save time for someone else who would like to
> help you, could you specify :
> - what platforms is (are) this ?
> - what versions of Apache and Tomcat ?
> - what do you use to connect Apache and Tomcat (mod_proxy_http,
> mod_proxy_ajp, mod_jk, other ?)
> - is Apache httpd configured to do any kind of caching ?
> - what is "WebLoad" ?
> - what do you mean by "page has a different encoding" ? How do you know
> that ? Is the HTTP response "Content-type" header different ? Is a <meta>
> tag in the page different ?
>
> (If you do not know the answer to that, search in Google for "Fiddler2".
> That is an add-on for IE, which allows you to see exactly what requests go
> from IE -> server, and the responses that go server -> IE. Including the
> HTTP headers, body etc..).
>
> Also, to stop you maybe looking in the wrong place, I believe that Apache
> content negociation only happens when you specify it explicitly, and it
> should only happen for content that Apache itself can serve locally, not for
> anything that is proxied somewhere else.
>
> Also, since according to your data below, it seems to be working fine in
> Tomcat itself, and not working fine when Apache httpd is in front of it, you
> may want to post this to the Apache httpd users list.
>
>
>
André and Martin, thanks for trying to help!
Before sending to Tomcat list I asked the same question at Apache httpd
users list. No comments so far :(
As a guideline for load balancing I used an approach outlined here:
http://www.theserverside.com/tt/knowledgecenter/knowledgecenter.tss?l=LoadBalancingTomcatApache
Some more context on my problem:
- Everything runs on Win32
- apache-tomcat-6.0.18
- Apache2.2
- mod_proxy_balancer
- WebLoad - is used as load generation tool
http://www.webload.org/
Here is a link<http://rapidshare.com/files/247362496/bad-response-data.zip.html>
to a zip file with:
- brokren response
- appache & tomcat conf
- Packets sniffed by WireShark (with and without balancer)
http://www.wireshark.org/
I will try to provide more data on the problem later.
Thanks!
Re: Apache Load Balancer - truncating responses?
Posted by "Dmitri O.Kondratiev" <do...@gmail.com>.
On Mon, Jun 22, 2009 at 1:14 AM, André Warnier <aw...@ice-sa.com> wrote:
> Dmitri O.Kondratiev wrote:
>
>> Hello!
>> I have the following problem:
>> When using apache load balancer with Tomcat, *sometimes* responses get
>> truncated , resulting in incomplete HTML of *wrong* encoding. My
>> application
>> that Tomcat runs always returns responses in utf-8, yet when truncated,
>> page
>> has a different encoding.
>>
>> The following combinations work:
>> 1) IE -> Tomcat
>> 2) IE -> Load Balancer -> Tomcat
>> 3) WebLoad -> Tomcat
>>
>> The following returns truncated HTML:
>> 1) WebLoad -> Load Balancer -> Tomcat
>>
>> Could Apache content negotiation be the reason for this error?
>> Any other ideas why this could happen?
>>
>> Hi.
> I can't answer, but just to save time for someone else who would like to
> help you, could you specify :
> - what platforms is (are) this ?
> - what versions of Apache and Tomcat ?
> - what do you use to connect Apache and Tomcat (mod_proxy_http,
> mod_proxy_ajp, mod_jk, other ?)
> - is Apache httpd configured to do any kind of caching ?
> - what is "WebLoad" ?
> - what do you mean by "page has a different encoding" ? How do you know
> that ? Is the HTTP response "Content-type" header different ? Is a <meta>
> tag in the page different ?
>
> (If you do not know the answer to that, search in Google for "Fiddler2".
> That is an add-on for IE, which allows you to see exactly what requests go
> from IE -> server, and the responses that go server -> IE. Including the
> HTTP headers, body etc..).
>
> Also, to stop you maybe looking in the wrong place, I believe that Apache
> content negociation only happens when you specify it explicitly, and it
> should only happen for content that Apache itself can serve locally, not for
> anything that is proxied somewhere else.
>
> Also, since according to your data below, it seems to be working fine in
> Tomcat itself, and not working fine when Apache httpd is in front of it, you
> may want to post this to the Apache httpd users list.
>
>
>
André and Martin, thanks for trying to help!
Before sending to Tomcat list I asked the same question at Apache httpd
users list. No comments so far :(
As a guideline for load balancing I used an approach outlined here:
http://www.theserverside.com/tt/knowledgecenter/knowledgecenter.tss?l=LoadBalancingTomcatApache
Some more context on my problem:
- Everything runs on Win32
- apache-tomcat-6.0.18
- Apache2.2
- mod_proxy_balancer
- WebLoad - is used as load generation tool
http://www.webload.org/
I am attaching a zip file with:
- brokren response
- appache & tomcat conf
- Packets sniffed by WireShark (with and without balancer)
http://www.wireshark.org/
I will try to provide more data on the problem later.
Thanks!
Re: Apache Load Balancer - truncating responses?
Posted by André Warnier <aw...@ice-sa.com>.
Dmitri O.Kondratiev wrote:
> Hello!
> I have the following problem:
> When using apache load balancer with Tomcat, *sometimes* responses get
> truncated , resulting in incomplete HTML of *wrong* encoding. My application
> that Tomcat runs always returns responses in utf-8, yet when truncated, page
> has a different encoding.
>
> The following combinations work:
> 1) IE -> Tomcat
> 2) IE -> Load Balancer -> Tomcat
> 3) WebLoad -> Tomcat
>
> The following returns truncated HTML:
> 1) WebLoad -> Load Balancer -> Tomcat
>
> Could Apache content negotiation be the reason for this error?
> Any other ideas why this could happen?
>
Hi.
I can't answer, but just to save time for someone else who would like to
help you, could you specify :
- what platforms is (are) this ?
- what versions of Apache and Tomcat ?
- what do you use to connect Apache and Tomcat (mod_proxy_http,
mod_proxy_ajp, mod_jk, other ?)
- is Apache httpd configured to do any kind of caching ?
- what is "WebLoad" ?
- what do you mean by "page has a different encoding" ? How do you know
that ? Is the HTTP response "Content-type" header different ? Is a
<meta> tag in the page different ?
(If you do not know the answer to that, search in Google for "Fiddler2".
That is an add-on for IE, which allows you to see exactly what
requests go from IE -> server, and the responses that go server -> IE.
Including the HTTP headers, body etc..).
Also, to stop you maybe looking in the wrong place, I believe that
Apache content negociation only happens when you specify it explicitly,
and it should only happen for content that Apache itself can serve
locally, not for anything that is proxied somewhere else.
Also, since according to your data below, it seems to be working fine in
Tomcat itself, and not working fine when Apache httpd is in front of it,
you may want to post this to the Apache httpd users list.
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