How to find out the proxy type?

Question

PHP

There is a proxy list in the database, the task is simple - add a new column to the database and write the proxy type in the empty field, but how can we find out this proxy type?
Maybe there is a Free API with some limits where you can check the proxy type?
Or tell me in php, maybe through curl you can somehow write a checker for checking HTTP / SOCKS yourself?

Answer 1

https://github.com/z3APA3A/3scan

>3scan 127.0.0.1 3130,3131 45pc detectportal.firefox.com / success 1000
127.0.0.1:3130/HTTP
127.0.0.1:3130/CONNECT 
127.0.0.1:3131/SOCKS4
127.0.0.1:3131/SOCKS5

Answer 2

https://hackware.ru/?p=10201