Why does this URL result in a 400 (Bad Request) error?

Igor Sysoev is at rambler-co.ru
Wed Nov 4 00:11:38 MSK 2009

On Tue, Nov 03, 2009 at 08:07:25PM +0000, John Moore wrote:

> Hello,
> I'm puzzled by a problem we've been getting with URLs like this:
> /webserviceakqa-geraldoflanagan_ais_JEzKjKps%2B0%2FAynL0G17OWg?line=cMyYNDWTMJCOFAMGPMHE
> nginx (version 0.6.35) is returning a Bad Request error, response code 
> 400. The problem seems to be in the URL encoding of the string after the 
> '_ais_' part - when there are no escaped characters (such as %2B), no 
> error is returned. If it is a deliberate feature, is there some way I 
> can bypass it?

In my tests 0.5.36, 0.6.39, 0.7.63, 0.8.22 try to open
and return 404. You may try to set error_log to info level to see 400 error

Igor Sysoev

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