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

[John Moore]

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?

JM