Apache httpd - ap_proxy_connect_backend disabling worker for (XXXX)

Problem

I have a web service which is published (by Camel y JBoss Fuse) in http://fuse-01:8888/conversor.
The service clients, instead of accessing the service directly, they will use an Apache httpd server as proxy.

I configure the proxy in this way, in /etc/httpd/conf.d:

<VirtualHost *:80>
    ServerName fuse-01   
    DocumentRoot /var/www/fuse-01

    <Directory /var/www/fuse-01>
        Options FollowSymLinks
        AllowOverride None
        Order deny,allow
        Allow from all
    </Directory>    


    # Configuración conversor PDF
    ProxyRequests     Off
    ProxyPreserveHost On

    <Location /conversor> 
 ProxyPass http://localhost:8888/conversor
 ProxyPassReverse http://localhost:8888/conversor
    </Location>


    ErrorLog logs/fuse-01-error_log
    CustomLog logs/fuse-01-access_log common
</VirtualHost>

But when I try http://fuse-01/conversor?wsdl I get the following error in the browser:

Error 503
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

By checking Apache logs files I see this in fuse-01-error_log:

[Sun Feb 12 11:28:59 2017] [error] (13)Permission denied: proxy: HTTP: attempt to connect to 192.168.56.103:8888 (fuse-01) failed
[Sun Feb 12 11:28:59 2017] [error] ap_proxy_connect_backend disabling worker for (fuse-01)

Solution

Execute the following command:

/usr/sbin/setsebool -P httpd_can_network_connect true

SELinux (Security-Enhanced Linux) is a security module for supporting access control security policies.
There are lots of boolean variables which control multiple security aspects of the system, and you can check then all by using:

getsebool -a

Statted from Redhat official doc:

httpd_can_network_connectWhen disabled, this Boolean prevents HTTP scripts and modules from initiating a connection to a network or remote port. Enable this Boolean to allow this access.