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Ok. I used Wireshark and tracked this down. I'm posting here so that
others will know why this happens. It is a result of poor behaviour in
Firebug. <br>
<br>
In fact, if you click on the log tab to view request data and headers
then Firebug actually re-submits the POST data a second (hidden) time
to provide data to show you. Of course, since POST methods will update
server data and could insert new database rows this is very bad of
Firebug. It is treating the POST like a GET in this case where it
should have logged the original POST reply data instead. I have posted
a bug in their google group and hopefully someday they will give it
some attention.<br>
<br>
When Firebug submits the second time it does NOT include the
Content-Length header as it did at first, but it shows as though it
did. This is why my page was correctly updated but an 411 error was
shown in the Firebug log. The original response was not saved and the
error was from the repeated POST request.<br>
<br>
Just something for people to be aware of. <br>
<br>
Chris :)<br>
<br>
<br>
Igor Sysoev wrote:
<blockquote cite="mid:20080817135922.GO8393@rambler-co.ru" type="cite">
<pre wrap="">On Sun, Aug 17, 2008 at 08:40:39PM +0700, Chris Savery wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Thanks Igor.
I turned on info and it says the reason is client didn't send
"Content-Length" header. Now, why would Firefox (3) not do that? Is this
common?
I noticed in Firebug that the header sent ALSO has "Transfer-Encoding:
chunked".
I had the same problem with Lightpd and using a Flash uploader but they
refuse to fix it to ignore chunked, so I could not use it with Flash.
One reason I switched to using nginx is that unlike Lighttpd it works
with the flash uploader.
So should I just ignore this as it still works as expected? But I
cannot see content in Firebug, or maybe I need to force a header in JS
code (maybe the mootools JS library mistakenly doesn't set the Content
Length hmm, I should explore that too.) Just a minefield. How is it that
the server returns this error page but also I am getting the JSON data
back as well?
</pre>
</blockquote>
<pre wrap=""><!---->
nginx tests Content-Length absence before Transfer-Encoding, thus
it logs this error, although the request is valid: it has either
Transfer-Encoding or Content-Length.
</pre>
<blockquote type="cite">
<pre wrap="">Igor Sysoev wrote:
</pre>
<blockquote type="cite">
<pre wrap="">On Sun, Aug 17, 2008 at 02:14:18PM +0700, Chris Savery wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I've been getting this error a lot in my testing. I never received it
with Apache. I understand what the message say but not why it's coming
about. My headers being sent have length. Or is this message referring
to content returned by PHP at the server end? I'm sure one of you
experts here knows what's going on with this. I only get it on POST
requests and not most of my ajax calls (which are GET).
Thanks for any help with tracking this down. I'm seeing it in Firebug
and when it occurs I cannot see the real response content - even though
content is indeed returned as well since it has effect on my javascript
code and updates the screen. Weird.
Chris :)
</pre>
</blockquote>
<pre wrap="">Set error_log level to info:
error_log /path/to/log info;
Then nginx will log a reason. Now there are 3 reasons:
"client sent invalid "Content-Length" header"
"client sent ... method without "Content-Length" header"
"client sent "Transfer-Encoding: chunked" header"
The last reason is nginx feature: it still does not support chunked body.
</pre>
<blockquote type="cite">
<pre wrap="">Response from server:
<html>
<head><title>411 Length Required</title></head>
<body bgcolor="white">
<center><h1>411 Length Required</h1></center>
<hr><center>nginx/0.6.32</center>
</body>
</html>
Header sent to server using ajax (only removed some identity info, HOST
line):
User-Agent Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1)
Gecko/2008072820 Firefox/3.0.1
Accept text/javascript, text/html, application/xml, text/xml, */*
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
X-Requested-With XMLHttpRequest
Content-Type application/x-www-form-urlencoded; charset=utf-8
Referer <a class="moz-txt-link-freetext" href="http://www.xxxxx.com/">http://www.xxxxx.com/</a>
Content-Length 269
Cookie ZZZZSession=3ce34bb3dbc257ff61405175f941f1d7
Pragma no-cache
Cache-Control no-cache
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
</blockquote>
<pre wrap=""><!---->
</pre>
</blockquote>
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