HAProxy random HTTP 503 errors

Question

We\'ve setup 3 servers:

• Server A with Nginx + HAproxy to perform load balancing
• backend server B
• backend server C

Here is our

Answer 1

I resolved my intermittent 503s with HAProxy by adding option http-server-close to backend. Looks like uWSGI (which is upstream) is not doing well with keep-alive. Not sure what's really behind the problem, but after adding this option, haven't seen single 503 since.