Redirect to a website with cloudflare 5 second pro

Question

I want to do a http get request to a page with a json result so i can parse it and do my things.

The website always have the cloudflare 5 second protection, or waits 5 seconds before it redirects in my chrome browser, but in my c# application i always get a 503 error with a http get or http post. I tried many ways with allowredirect=true but i just can't do it! Can someone help me?

I need to wait 5 seconds and then get the correct page. Any way to do it?