Permission denied: proxy: HTTP

Permission denied:proxy: HTTP  :: This error is caused when you try to use proxy balancer when seLinux is enabled.  The value for httpd_can_network_connect is turned off by default. You can work around this problem  as explained below.

See the selinux status by issusing the command below :

sestatus -b | grep httpd

Now change the value to enabled by issuing the following command :

setsebool -P httpd_can_network_connect=1