Proxy Error the proxy server received an invalid response from an upstream server

Question

I configured Haproxy server in my system, but I am getting this below error from my Haproxy server.

Proxy Error the proxy server received an invalid response from an upstream server.

How can I solve this error?

Answer 1

Hi@akhtar,

I think you did not configure your haproxy.conf file. So try to configure backend part in this file properly.

frontend  main *:5000
    acl url_static       path_beg       -i /static /images /javascript /stylesheets
    acl url_static       path_end       -i .jpg .gif .png .css .js

    use_backend static          if url_static
    default_backend             app
#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static
    balance     roundrobin
    server      static 127.0.0.1:4331 check
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
    balance     roundrobin
    server  app1 127.0.0.1:5001 check
    server  app2 127.0.0.1:5002 check
    server  app3 127.0.0.1:5003 check
    server  app4 127.0.0.1:5004 check

Here you have to set your ip properly.