How to Use apache_proxy for forwarding

In some cases, Apache's proxy function is often used. The specific meaning is that in some cases, Apache replaces users for HTTP transfer requests, the proxy function everywhere on the Internet is the specific application of this function.
To use proxy, you need to install the Apache DSO of mod_proxy, and then add a configuration file similar to the following in Apache:

<Virtualhost *: 80>
Servername img.aaa.bbb.com
DocumentRoot/home/share/htdocs/img
Errorlog logs/Apache/img/Error

Rewriteengine on
# Rewriteloglevel 4
Rewritelog "logs/yapache/rewritelog_yimg"
Rewritecond/home/share/htdocs/img/% {request_filename }! -F
Rewriterule ^/(. +) $ http://im%1.img.aaa.bbb.com/cn/#1 [QSA, P, L]

</Virtualhost>