How to secure reverse proxy or Forward proxy

How to secure reverse proxy or Forward proxy

ProxyPreserveHost On

<Proxy *>
Order deny,allow
Allow from all
</Proxy>

ProxyPass        /gonvaled/examples/jsonrpc/output/services/ http://localhost:8000/services/
ProxyPassReverse /gonvaled/examples/jsonrpc/output/services/ http://localhost:8000/services/

<IfModule mod_proxy.c>
#turning ProxyRequests on and allowing proxying from all may allow
#spammers to use your proxy to send email.

ProxyRequests Off
<Proxy *>
AddDefaultCharset off
Order Allow,Deny
Allow from all
</Proxy>

ProxyPass /transmission http://localhost:9091/transmission
ProxyPassReverse /transmission http://localhost:9091/transmission
# Line below is optional
Redirect permanent /transmission https://myserver.com/transmission/web/

# Enable/disable the handling of HTTP/1.1 “Via:” headers.
# (“Full” adds the server version; “Block” removes all outgoing Via: headers)
# Set to one of: Off | On | Full | Block

ProxyVia On
</IfModule>

ifmodule mod_proxy.c=””>
# set ProxyRequests off since we’re only using the ProxyPass and ProxyPassReverse
# directives. this keeps the server secure from
# spammers trying to use your proxy to send email.

ProxyRequests Off

<proxy *=””>
AddDefaultCharset off
Order deny,allow
Allow from all
#Allow from .example.com
</proxy>

# Enable/disable the handling of HTTP/1.1 “Via:” headers.
# (“Full” adds the server version; “Block” removes all outgoing Via: headers)
# Set to one of: Off | On | Full | Block

ProxyVia On</ifmodule>

# Put this in the main section of your configuration (or desired virtual host, if using Apache virtual hosts)
ProxyRequests Off
ProxyPreserveHost On

<proxy *=””>
Order deny,allow
Allow from all
</proxy>