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

[John Moore]

Igor Sysoev wrote:
>
>
> Have this resolved Tomcat issue ? It's really strange that Tomcat does not
> support the encoded URL.
>
>   
It seems to have done, yes. It's had a slight side-effect, though, in 
that I'm now getting a 404 error from nginx on a particular page, which 
it should be proxying. How would the addition of the forward slash to 
http://backend cause this, and what do I need to do to compensate?

JM