You can configure proxy server by using following steps

Step1:- First open xampp control pannel then click on Config after select Apache(httpd.conf) just like show on below image

Step2:- after find below line and remove (#) from front that mentation on below image you can also search mod_proxy_http

Remove #

Replace this below line

#LoadModule proxy_http_module modules/mod_proxy_http.so

Replace with
LoadModule proxy_http_module modules/mod_proxy_http.so

Step3:- Now add proxy server website or IP
example:-
ProxyPass /coderraj http://coderraj.in/

Now you want to access proxy server the hit url on your browser

https://localhost/coderraj


Also read this