400 errors for some clients: not related to buffer size and works over HTTPS but not HTTP

Benjamin Jackson bhjackson at gmail.com
Wed Oct 14 20:31:04 MSD 2009

So it would seem (at least from the source of 0.5.33 that I was able
to find quickly on Google) that the duplicates are in fact causing
this error in the ngx_http_process_unique_header_line function.

Is there a good reason for this to cause a 400 error if the duplicate
values are equal? Or was this maybe fixed in a newer version? I'm
running 0.4 (yeah, I know that I need to upgrade).

On Wed, Oct 14, 2009 at 1:05 PM, Benjamin Jackson <bhjackson at gmail.com> wrote:
> All I see from the error log on the relevant IP when changing the log
> level is this:
> 2009/10/14 15:57:33 [info] 20713#0: *1966 client sent duplicate header
> line: "Connection: keep-alive", previous value: "Connection:
> keep-alive" while reading client request headers, client:
>, server: incomumdesign.com, URL: "/favicon.ico", host:
> "www.drinkbrainjuice.com", referrer: "http://www.drinkbrainjuice.com/"
> Could the duplicate header line be the cause of this error? If so, how
> can I fix it?
> 2009/7/31 Igor Sysoev <is at rambler-co.ru>:
>> On Thu, Jul 30, 2009 at 05:47:45PM -0300, Benjamin Jackson wrote:
>>> Has anyone seen anything like this before? We have no idea what's
>>> going on. The buffers are set to 4/16k but still the client can't open
>>> the site.
>> You should set error_log to info level to see causes of 400 errors.
>> The most of them may be SSL handshake errors.
>> --
>> Igor Sysoev
>> http://sysoev.ru/en/

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