411 Length Required error

Chris Savery chrissavery at gmail.com
Sun Aug 17 17:40:39 MSD 2008

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 

I noticed in Firebug that the header sent ALSO has "Transfer-Encoding: 
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?

Chris :)

Igor Sysoev wrote:
> On Sun, Aug 17, 2008 at 02:14:18PM +0700, Chris Savery wrote:
>> 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 :)
> 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.
>> 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: 
>> 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 	http://www.xxxxx.com/
>> Content-Length 	269
>> Cookie 	ZZZZSession=3ce34bb3dbc257ff61405175f941f1d7
>> Pragma 	no-cache
>> Cache-Control 	no-cache

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