Nginx proxy_intercept_errors

[Kiril Kalchev]

Hi,

I have noticed that when I set 'proxy_intercept_errors on;'  in my nginx config it kills tcp connection to the origin server if it returns 4xx or 5xx?
This is my example config to reproduce the situation(https://gist.github.com/kirilkalchev/5098882).  I am in a situation where my backend server returns only 403 and 404 (it is some kind of home made authentication system 403 means go away 404 means continue) and I need to display different things in this cases, but without keep alive connections to the backend are exhausted pretty fast.

Thanks,
Kiril 
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