How to safely write parsers, grabbers?

Question

Parsing

Hello guys, how can I safely write a program in which there will be a lot of requests in the form of parsing and grabbing, for 1 - 2 sites?
Let's say I need to parse 100 products and perform 40 - 50 such operations per minute? It's clear that any site will block IP, so you need a lot of proxy addresses that will be updated every 1 - 2 minutes. Do I understand correctly? And where to get so many proxies? Or is it done differently? Thank you for your attention!

Answer 1

You understand everything correctly, but there are entire exchanges for proxies and you can buy thousands of them.
PS. If the site is behind a CDN and not one and a half diggers administer it, then proxies will no longer help because machine algorithms work there and monitor a huge number of metrics

Answer 2

Yes, no one will block anything. It's not even DoS. You first write a program that will be able to make requests at such a speed - you need at least 10 threads per vskidka.