Re: Erratic HTTP response behavior

Martin Gainty Wed, 13 Jun 2007 18:47:58 -0700

if you are setting Transfer-encoding to 'chunked' as in
response.setHeader( "Transfer-Encoding", "chunked");
then read and follow these directives
http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html


Caveat Emptor!
Martin-
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----- Original Message -----From: "Len Popp" <[EMAIL PROTECTED]>

To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Wednesday, June 13, 2007 7:38 PM
Subject: Re: Erratic HTTP response behavior

It's pretty obvious by now that no-one's going to be able to email you
a solution to your problem, which seems unique or at least very
unusual. You're going to have to dig deeply into this one yourself.

Here's what I'd do, if it helps you any. I would track the problem
requests from the browser to the server and back again, at several
points, to see where it's going wrong.
- Look at the request and response in the browser using a plug-in like
LiveHTTPHeaders or ieHTTPHeaders.
- Log the requests received by Tomcat (AccessLogValve orRequestDumperValve).
- Put logging messages in your application, in every servlet or JSP,
to see what piece of code is executed for each request.
- Use a network sniffer (e.g. Wireshark) to see if the HTTP responses
are being sent to the correct clients. You may have to log traffic at
both the client and server ends if there's a proxy or gateway between
them.

Given all of those logs, you should be able to figure out where a
particular request went astray - in Tomcat, in the application, or in
the network. My money's on the network.
--
Len

On 6/13/07, Matt Cosentino <[EMAIL PROTECTED]> wrote:
Well that didn't last long. After making some other changes the problemhas returned... with a vengeance! Seriously, it's even weirder thanbefore. Not only are some responses coming back chunked, but some arecoming back completely wrong. Like I try to open my index page and itresponds with an image. I tried reverting everything that I changed backto how they were before and the problem doesn't go away. So strange,could really use some help.
----- Original Message ----
From: Matt Cosentino <[EMAIL PROTECTED]>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Wednesday, June 13, 2007 2:20:24 PM
Subject: Re: Erratic HTTP response behavior
Ok, so I made a small change and somehow I think I fixed it. I removedthe following line from my page:
<link rel="icon" type="image/x-icon" href="/images/icon.ico">
This happened by accident, I only removed it because the icon didn'texist at that path. After doing that I noticed that everything wouldalways load correctly.
I then added it back to see if that really did fix it, and sure enoughthe problem came back. Then I just moved the line before some files thatI often had problems loading, and the problem went away. So it seems tome that when Tomcat tried to respond to that request it was breaking theresponses of the other resources, somehow. I don't understand it, but Ifigured I'd at least share my experience in case this helps anyone else.
----- Original Message ----
From: Matt Cosentino <[EMAIL PROTECTED]>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Monday, June 11, 2007 1:07:37 PM
Subject: Re: Erratic HTTP response behavior
In a previous discussion it was said that the problem was fixed in5.5.17, so maybe the problem was reintroduced somehow.
----- Original Message ----
From: Matt Cosentino <[EMAIL PROTECTED]>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Friday, June 8, 2007 6:12:28 PM
Subject: Re: Erratic HTTP response behavior
I tried looking through the archive and just couldn't find any help. Theproblem has recently reproduced itself on a new Tomcat 5.5.23 install onone of my co-worker's machine, so it's not my PC. I've also experiencedit more often with random images or other resources not loading, and whenI check the network monitor in Firebug it lists the transfer-encoding forthem as chunked. Luckily this problem has never surfaced on ourproduction server which is version 5.5.17, but I don't see anyconfiguration differences. This is driving me nuts, so any help would begreatly appreciated.
----- Original Message ----
From: Matt Cosentino <[EMAIL PROTECTED]>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Friday, May 25, 2007 4:09:57 PM
Subject: Re: Erratic HTTP response behavior
No I am on intending on using chunked responses. Is there a way todisable it?
----- Original Message ----
From: Christopher Schultz <[EMAIL PROTECTED]>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Friday, May 25, 2007 4:02:58 PM
Subject: Re: Erratic HTTP response behavior

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Hash: SHA1

Matt,

You're right, this /is/ erratic behavior. I think something is going
wrong with your headers or something:

Matt Cosentino wrote:
> </body></html>0 HTTP/1.1 200 OKServer:> Apache-Coyote/1.1Transfer-Encoding: chunkedDate: Fri, 18 May 2007> 22:35:13 GMT
Your response headers appear to be after the body of the response.
Either that or the headers I see there are supposed to be the headers
from the next chunk and/or request in a keepalive request.

Are you intending to use "chunked" responses? 'Cause it looks like they
are being used. There was some in-depth discussion of chunked responses
somewhat recently on the list. Perhaps you could take a look at that for
some reference points (but I'm not saying that it will solve yourproblem).
I think the problem might be that you are getting chunked encoding for
some reason, but you don't really want it.

- -chris
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Re: Erratic HTTP response behavior

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