The following reply was made to PR general/1142; it has been noted by GNATS.
From: Dean Gaudet <[EMAIL PROTECTED]>
To: Doug Salot <[EMAIL PROTECTED]>
Subject: Re: general/1142: spurious POST or PUT without Content-length errors
Date: Fri, 26 Sep 1997 12:46:21 -0700 (PDT)
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Oh wow, it's a really weird browser bug it looks like. It is definately
sending a request w/o Content-Length. Here's what it sent:
POST /cgi/getacct.cgi HTTP/1.0.
Referer: http://www.haggle.com/account.html.
Connection: Keep-Alive.
User-Agent: Mozilla/3.02 (WinNT; U).
Host: www.haggle.com.
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*.
Cookie: [EMAIL PROTECTED]
The trailing . are CR. There should be one more line, which is the
CRLF that terminates the headers, it never appears. For example here is
a valid GET later on in the capture:
GET /account.html HTTP/1.0.
If-Modified-Since: Tuesday, 16-Sep-97 18:08:56 GMT; length=1965.
Referer: http://www.haggle.com/.
Connection: Keep-Alive.
User-Agent: Mozilla/3.02 (WinNT; U).
Pragma: no-cache.
Host: www.haggle.com.
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*.
.
The first POST does not timeout on the server side. What has happened is that
netscape has kept-alive a connection and sent the bogus POST above to
it. The server responds immediately with an RST, I'm guessing because it has
already closed that connection due to the keep-alive timeout. Somehow
netscape doesn't notice that closure immediately.
Three seconds later a new connection is opened and the POST is re-sent
(this is normal behaviour for a keep-alive browser in response to a
closed connection). The server is still waiting for the rest of the data,
and a minute passes without event. Then you reloaded the page.
Hmm. It would be nice to see what happened before this point, specifically
what other traffic went on that first keep-alive connection. We might be
able to chase down what is causing netscape to flub up like this. If I
could trouble you to do this again but run the tcpdump before you even fire
up the browser. Then we'll have a record of all the tcp sessions.
Thanks
Dean
On Fri, 26 Sep 1997, Doug Salot wrote:
> OK, I've attached a dump of a sesion in which this problem was reproduced.
>
> Here were the steps taken:
>
> 1) go to the page with the form
> 2) turn on tcpdump
> 3) hit the submit button
> 4) wait for a long time, but not long enough for a timeout
> 5) hit the stop button
> 6) reload the html page (as a marker for the dump)
>
> Here's what appeared in the error log:
> [Fri Sep 26 12:42:54 1997] access to /home/dsalot/html/cgi/getacct.cgi
> failed for 209.1.103.92, reason: POST or PUT without Content-length:
> [Fri Sep 26 12:42:54 1997] request lost connection to client 209.1.103.92
>
> It's interesting to note that we did this twice. The first time we let
> the server time-out. The time-out was logged, but there was no error
> about content-length. So it seems like the server is sitting there
> waiting for data that the browser thinks it already sent.
>
> Doug Salot
> Haggle Online
> http://www.haggle.com
>
> On Wed, 24 Sep 1997 [EMAIL PROTECTED] wrote:
>
> > Synopsis: spurious POST or PUT without Content-length errors
> >
> > State-Changed-From-To: open-feedback
> > State-Changed-By: dgaudet
> > State-Changed-When: Wed Sep 24 23:44:09 PDT 1997
> > State-Changed-Why:
> > The single most useful thing now would be a tcpdump of a session
> > showing this error. We need full packets so that we can analyse
> > what the browser sent and how the server reacted. So you need to
> > do something like this:
> >
> > tcpdump -s 1514 -w dumpfile tcp port 80 and host clientname
> >
> > as root on a machine on the same ethernet segment as either the
> > server or the client. Then gzip the dumpfile and put it up for
> > ftp/http and tell us where to get it.
> >
> > Thanks
> > Dean
> >
>
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